# Ontario Heat Loss & BCIN Design

> Permit-Ready Heat Loss Calculations & Radiant Design


## Pages

- [Heat Loss Calculation for Home Additions Ontario](https://ontarioheatloss.ca/heat-loss-calculation-home-additions-ontario/): Adding a home addition in Ontario almost always requires a building permit — and most addition permits require HVAC documentation for how the addition will be heated and cooled.
- [HVAC Design for Second Suites Ontario | Separate System, Dedicated Ventilation](https://ontarioheatloss.ca/hvac-design-second-suite-ontario/): Adding a basement apartment, garage suite or ADU? Start with the furnace.
- [Heat Loss Calculation for Renovations and Additions Ontario | OBC 2024 Guide](https://ontarioheatloss.ca/heat-loss-calculation-renovation-ontario/): A heat loss calculation for a renovation or addition in Ontario differs from a new home calculation in a fundamental way: the existing building is already built, with an existing heating system that may or may not be capable of serving the new or renovated space.
- [Ductless Mini Split Permit Ontario | When You Need One and What It Requires](https://ontarioheatloss.ca/ductless-mini-split-permit-ontario/): A ductless mini split — a wall-mounted or ceiling-cassette cold climate heat pump without a duct distribution system — is one of the most common sources of permit confusion in Ontario residential construction.
- [Propane Heating Design Ontario | Correct Sizing at Your OBC Design Temperature](https://ontarioheatloss.ca/propane-heating-design-ontario/): Propane is the primary heating fuel for most of rural Ontario and cottage country — Muskoka, Georgian Bay, Haliburton, Grey County, and the non-municipal-gas areas of Simcoe County all rely on it.
- [Heat Loss Calculation Penetanguishene | -24°C Zone 6 · OBC 2024 · 48h](https://ontarioheatloss.ca/heat-loss-penetanguishene/): CSA F280 heat loss calculations for Penetanguishene building permits at the correct Climate Zone 6 design temperature — BCIN-stamped, accepted by the Town of Penetanguishene Building Department, delivered in 48 hours.
- [Heat Loss Calculation York Region | -21 to -22°C Zone 6 · OBC 2024](https://ontarioheatloss.ca/heat-loss-york-region/): BCIN-stamped CSA F280 heat loss calculations and HVAC design for every York Region municipality — sized to the correct Climate Zone 6 design temperature for your town, formatted for the local building department.
- [Hybrid Heat Pump Design Ontario | When All-Electric Isn't the Answer](https://ontarioheatloss.ca/hybrid-heat-pump-design-ontario/): A hybrid heat pump system pairs a cold climate heat pump with a gas or propane furnace backup — the heat pump handles heating down to a calculated balance point temperature, below which the furnace takes over.
- [HRV Selection Guide Ontario | SRE at -25°C, SB-12 and the MVDS Explained](https://ontarioheatloss.ca/hrv-selection-guide-ontario/): Selecting an HRV or ERV for an Ontario home is no longer an afterthought — under OBC 2024 the selected unit must be documented in the Mechanical Ventilation Design Summary (MVDS) before the building permit is issued.
- [Heat Pump Permit Ontario: When You Need One and What It Takes](https://ontarioheatloss.ca/heat-pump-permit-ontario/): Every cold climate heat pump installation in Ontario requires a building permit.
- [Heat Loss Calculations for ICF Homes Ontario | 40–60% Lower Loads Explained](https://ontarioheatloss.ca/icf-home-heat-loss-ontario/): Insulating Concrete Form (ICF) construction changes the heat loss calculation for an Ontario home in two meaningful ways.
- [HVAC design for an Orillia building permit](https://ontarioheatloss.ca/hvac-design-orillia/): Orillia publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for an Aurora building permit](https://ontarioheatloss.ca/hvac-design-aurora/): Aurora publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [Heat Loss Calculation Oro-Medonte | -24°C · Zoning Certificate First · Cloudpermit](https://ontarioheatloss.ca/heat-loss-oro-medonte/): Oro-Medonte is one of Simcoe County's most active custom home townships — elevated terrain between Lake Simcoe and Georgian Bay, significant rural acreage, and a growing permanent residential market alongside the established recreational base.
- [Mechanical Permit vs Building Permit Ontario | What's the Difference?](https://ontarioheatloss.ca/mechanical-permit-vs-building-permit-ontario/): In Ontario, there is no separate "mechanical permit" as a distinct permit class under the Ontario Building Code — there is only a building permit, which covers all types of construction including mechanical systems.
- [Ontario HVAC Permit Checklist 2025 | OBC 2024 Complete Document Reference](https://ontarioheatloss.ca/hvac-permit-ontario-checklist/): This is the complete OBC 2024 HVAC permit document checklist for Ontario residential new construction — every document required, every BCIN requirement, every municipality-specific consideration.
- [Heat Loss Calculation Simcoe County | -21°C to -25°C · All Municipalities](https://ontarioheatloss.ca/heat-loss-simcoe-county/): BCIN-stamped CSA F280 heat loss calculations and HVAC design for every Simcoe County municipality — sized to the correct local design temperature and formatted for your town building department.
- [OBC 2024 HVAC Changes Ontario | What Changed for Residential Permits](https://ontarioheatloss.ca/obc-2024-hvac-changes-ontario/): The Ontario Building Code 2024 (OBC 2024) came into force January 1, 2025, with full enforcement for all new building permit applications from April 1, 2025.
- [What Is Schedule 1 in an Ontario Building Permit? | Designer Declaration Guide](https://ontarioheatloss.ca/schedule-1-ontario-building-permit/): Schedule 1 is a form prescribed under the Ontario Building Code Act that a registered designer must complete, sign, and submit with a building permit application when the design work requires a BCIN-registered designer.
- [What Is the RMVDS (MVDS) in Ontario? Ventilation Design Summary](https://ontarioheatloss.ca/what-is-mvds-ontario/): Ontario Heat Loss & BCIN DesignPermit-Ready Calculations · Province-Wide HomeGuidesServicesFree ToolsAreas We ServeAboutContact 705-533-1633Get Free Quote Home›Guides›What Is the MVDS in Ontario?
- [HVAC Design for Garden Suites Ontario | OBC 2024 · BCIN-Stamped · 48h](https://ontarioheatloss.ca/hvac-design-garden-suite-ontario/): A garden suite — Ontario's term for a detached accessory dwelling unit in the rear yard of a residential property — is a standalone building with its own independent heating and ventilation system.
- [Duct Design Services Ontario | Calculated CFM · BCIN-Stamped · 48h](https://ontarioheatloss.ca/duct-design-services-ontario/): A duct design is not the same thing as a duct layout. Every HVAC contractor can sketch where ducts will run.
- [What Is a BCIN Designer in Ontario? | Registration, Categories & Verification](https://ontarioheatloss.ca/what-is-bcin-ontario/): Ontario Heat Loss & BCIN DesignPermit-Ready Calculations · Province-Wide HomeGuidesServicesFree ToolsAreas We ServeAboutContact 705-533-1633Get Free Quote Home›Guides›What Is a BCIN Designer in Ontario?
- [Choosing an HVAC Designer for Your Ontario Custom Home | 2026 Guide](https://ontarioheatloss.ca/choosing-hvac-designer-custom-home-ontario/): The HVAC designer for your Ontario custom home is not the same person as your HVAC contractor — or at least they should not be selected on the same criteria.
- [Benefits of Professional Duct Design | Ontario Custom Home Guide](https://ontarioheatloss.ca/benefits-of-professional-duct-design/): Most HVAC contractors lay out ductwork from experience and intuition — and for a standard production home with a typical floor plan, this produces a system that works acceptably.
- [Second Suite HVAC Compliance Ontario | OBC 2024 Requirements Guide](https://ontarioheatloss.ca/second-suite-hvac-compliance-ontario/): Adding a basement apartment, garage suite or ADU? Start with the furnace.
- [HVAC Design for Legal Basement Apartments Ontario | OBC 2024 Guide](https://ontarioheatloss.ca/hvac-design-legal-basement-apartment-ontario/): Adding a legal basement apartment in Ontario requires a building permit — and that permit requires HVAC documentation for the second suite's heating system.
- [Sizing an Air Conditioner for a Custom Home Ontario | Heat Gain Guide](https://ontarioheatloss.ca/sizing-air-conditioner-custom-home-ontario/): The most common air conditioning sizing mistake in Ontario custom homes is using square footage multipliers — "400 sq ft per ton" or similar rules of thumb — instead of a room-by-room heat gain calculation.
- [Why Is CSA F280 Mandatory in Ontario? | OBC Section 9.33.2.2 Explained](https://ontarioheatloss.ca/why-is-f280-mandatory-ontario/): Home›Guides›Why Is CSA F280 Mandatory in Ontario?
- [Heat Loss vs Heat Gain Calculation Explained | Ontario HVAC Guide](https://ontarioheatloss.ca/heat-loss-vs-heat-gain-explained/): Heat loss and heat gain are not two versions of the same calculation.
- [Do I Need a BCIN for a Furnace Replacement in Ontario? | Permit Guide](https://ontarioheatloss.ca/do-i-need-bcin-furnace-replacement-ontario/): Home›Guides›Do I Need a BCIN for a Furnace Replacement?
- [Who Can Sign an HVAC Design in Ontario? BCIN, P.Eng. & the Homeowner Exemption](https://ontarioheatloss.ca/who-can-sign-hvac-design-ontario/): Ontario Heat Loss & BCIN DesignPermit-Ready Calculations · Province-Wide HomeGuidesServicesFree ToolsAreas We ServeAboutContact 705-533-1633Get Free Quote Home›Guides›Who Can Sign an HVAC Design in Ontario?
- [How Much Do Heat Loss Calculations Cost in Ontario? 2026 Guide](https://ontarioheatloss.ca/how-much-do-heat-loss-calculations-cost/): Home›Guides›How Much Do Heat Loss Calculations Cost?
- [Heat Loss Calculation Georgian Bay Township | -24°C Zone 6 · OBC 2024](https://ontarioheatloss.ca/heat-loss-georgian-bay/): CSA F280 heat loss calculations for Georgian Bay Township building permits at the correct Climate Zone 7 design temperature — BCIN-stamped, accepted by the Township of Georgian Bay Building Department, delivered in 48 hours.
- [Heat Loss Calculation Grey County | Owen Sound -19°C Zone 6 · OBC 2024](https://ontarioheatloss.ca/heat-loss-grey-county/): CSA F280 heat loss calculations for Grey County building permits at the correct Climate Zone 6 design temperature — BCIN-stamped, accepted by your local Grey County municipality building department, delivered in 48 hours.
- [Heat Loss Calculation Blue Mountains | -21°C Zone 6 · OBC 2024 · 48h](https://ontarioheatloss.ca/heat-loss-blue-mountains/): CSA F280 heat loss calculations for Blue Mountains building permits at the correct Climate Zone 6 design temperature — BCIN-stamped, accepted by the Town of The Blue Mountains Building Department, delivered in 48 hours.
- [Heat Loss Calculation Aurora | -21°C Zone 6 · OBC 2024 · 48h](https://ontarioheatloss.ca/heat-loss-aurora/): CSA F280 heat loss calculations for Aurora building permits at the correct Climate Zone 6 design temperature — BCIN-stamped, accepted by the Town of Aurora Building Division, delivered in 48 hours.
- [Heat Loss Calculation Newmarket | -22°C Zone 6 · OBC 2024 · 48h](https://ontarioheatloss.ca/heat-loss-newmarket/): CSA F280 heat loss calculations for Newmarket building permits at the correct Climate Zone 6 design temperature — BCIN-stamped, accepted by the Town of Newmarket Building Services, delivered in 48 hours.
- [Heat Loss Calculation Innisfil | -23°C · Cloudpermit · OBC 2024](https://ontarioheatloss.ca/heat-loss-innisfil/): Innisfil's design temperature of -20°C sits between the two most common reference points designers reach for — the GTA's -18°C to the south and Barrie's -24°C to the north.
- [Heat Loss Calculation Orillia | -25°C Zone 6 · OBC 2024 · 48h](https://ontarioheatloss.ca/heat-loss-orillia/): CSA F280 heat loss calculations for Orillia building permits at the correct Climate Zone 6 design temperature — BCIN-stamped, accepted by the City of Orillia Building Department, delivered in 48 hours.
- [HVAC design for an Innisfil building permit](https://ontarioheatloss.ca/hvac-design-innisfil/): Innisfil is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC design for a Newmarket building permit](https://ontarioheatloss.ca/hvac-design-newmarket/): Newmarket will not issue a permit for a new dwelling until the mechanical package is in.
- [HVAC design for a Midland building permit](https://ontarioheatloss.ca/hvac-design-midland/): Midland publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for a Wasaga Beach building permit](https://ontarioheatloss.ca/hvac-design-wasaga-beach/): Wasaga Beach is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC design for a Muskoka building permit](https://ontarioheatloss.ca/hvac-design-muskoka/): Muskoka is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC design for an Oro-Medonte building permit](https://ontarioheatloss.ca/hvac-design-oro-medonte/): Oro-Medonte is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC design for a Collingwood building permit](https://ontarioheatloss.ca/hvac-design-collingwood/): Collingwood will not issue a permit for a new dwelling until the mechanical package is in.
- [HVAC design for a Barrie building permit](https://ontarioheatloss.ca/hvac-design-barrie/): Barrie will not issue a permit for a new dwelling until the mechanical package is in.
- [Radiant Floor Heating Design King City | -21°C Zone 6 · OBC 2024](https://ontarioheatloss.ca/radiant-heating-design-king-city/): In-floor and hydronic radiant design for King City, Nobleton, Schomberg and King Township — CSA F280 load, supply-water temperature, loop and manifold sizing, and boiler or air-to-water heat pump selection, all BCIN-stamped for the Township of King.
- [Radiant Heating Design Simcoe County | In-Floor Systems Zone 6](https://ontarioheatloss.ca/radiant-heating-design-simcoe-county/): In-floor and hydronic radiant design for every Simcoe County municipality — CSA F280 load, supply-water temperature, loop and manifold sizing, and boiler or air-to-water heat pump selection, BCIN-stamped for your town.
- [HVAC Design for Custom Homes Ontario | The Complete Process](https://ontarioheatloss.ca/hvac-design-custom-homes-ontario/): The question sounds simple.
- [Radian Heating Design Oro-Medonte](https://ontarioheatloss.ca/radiant-heating-design-oro-medonte/): Oro-Medonte is Simcoe County's largest municipality by area — a township of custom acreage properties, rural estates, ski-hill retreats near Horseshoe Valley, and waterfront homes along Lake Simcoe's eastern shore.
- [Heat Loss Calculation King City](https://ontarioheatloss.ca/heat-loss-king-city/): King City sits in Climate Zone 5 at a heating design temperature of -18°C — meaningfully milder than Barrie (-24°C) or Muskoka (-28°C), but that number still determines every equipment-sizing decision in your permit package.
- [Radiant Heating Design Muskoka | Hydronic Floors Sized for -26°C Zone 6](https://ontarioheatloss.ca/radiant-heating-design-muskoka/): Muskoka sits in Climate Zone 7 with a heating design temperature of -26°C — 10°C colder than Collingwood, 6°C colder than Barrie, and 10°C colder than Toronto.
- [Heating Design Collingwood: In-Floor Heating for Georgian Bay Homes Done Right](https://ontarioheatloss.ca/radiant-heating-design-collingwood/): Collingwood sits at -21°C on the design day — milder than Barrie, colder than most of Ontario's major cities, and exposed to Georgian Bay's prevailing westerlies in a way that changes infiltration assumptions for waterfront and shoreline properties.
- [Radiant Heating Design Barrie: Warm Floors Built for Barrie's -24°C Design Day](https://ontarioheatloss.ca/radiant-heating-design-barrie/): Radiant floor heating in Barrie is not the same calculation as radiant in Toronto.
- [Radiant Manifold Layout Ontario: The Quiet Detail That Makes or Breaks a Good Radiant System](https://ontarioheatloss.ca/radiant-manifold-layout-ontario/): Nobody buys a radiant floor system because they're excited about manifolds. They buy it for warm feet and even temperatures.
- [Boiler Sizing for Radiant Floor Ontario: Bigger Is Not Better, It’s Usually Just Wrong](https://ontarioheatloss.ca/boiler-sizing-for-radiant-floor-ontario/): The conversation about which boiler to buy usually starts with the wrong question.
- [Radiant Slab Design Ontario: Warm Concrete Is Easy — Designing It Properly Is the Trick](https://ontarioheatloss.ca/radiant-slab-design-ontario/): Getting tubing into a concrete slab is straightforward.
- [Cold Climate Heat Pump Ontario: What Actually Works When Winter Stops Being Polite](https://ontarioheatloss.ca/cold-climate-heat-pump-ontario/): Every heat pump brochure says it works in cold weather. The fine print says something more specific — and more useful.
- [HRV / ERV Design Ontario: Better Air Starts With Better Planning](https://ontarioheatloss.ca/hrv-erv-design-ontario/): Since January 1, 2025, an HRV or ERV is mandatory in every new Ontario home under OBC 2024. But the code requirement is the floor — not the goal.
- [Building Permit HVAC Requirements Ontario: What Municipalities Actually Ask For](https://ontarioheatloss.ca/building-permit-hvac-requirements-ontario/): The Ontario Building Code sets the floor for HVAC permit requirements. Then 444 municipalities each add their own layer on top.
- [Radiant Floor Heating Design Ontario: Warm Floors Are Easy, Correct Design Is the Hard Part](https://ontarioheatloss.ca/radiant-floor-heating-design-ontario/): Anybody can tell you radiant floor heat feels nice. That part is easy.
- [Guides](https://ontarioheatloss.ca/guides/): Plain-English guides for Ontario homeowners, self-builders, and contractors navigating CSA F280 heat loss calculations, cold-climate heat pumps, building permits, and HVAC design.
- [Why Your CSA F280 Heat Loss Calculation Gets Rejected by Ontario Building Departments](https://ontarioheatloss.ca/guides-heat-loss-calculation-rejected/): After 45 years of building homes in Ontario, I've seen every reason a heat loss report gets bounced back. Most of them have nothing to do with the math.
- [About | Ontario Heat Loss & BCIN Design](https://ontarioheatloss.ca/about/): We are a BCIN-registered HVAC design service based in Simcoe County, Ontario.
- [Free Tools](https://ontarioheatloss.ca/free-tools/): Design temperature lookup, quick heat loss estimator, heat pump sizing checker, and permit checklist — everything you need to understand your project before you commit to a permit package.
- [contact](https://ontarioheatloss.ca/contact/): Not sure what your building department requires?
- [thank-you](https://ontarioheatloss.ca/thank-you/): Your order has been received and payment processed successfully.
- [Areas We Serve | CSA F280 Heat Loss Calculation — Every Ontario Municipality](https://ontarioheatloss.ca/areas-we-serve/): We serve every municipality in Ontario — from Barrie to Bracebridge, Collingwood to Cornwall, Wasaga Beach to Windsor.
- [Heat Loss Calculation Tiny Township | -24°C Zone 6 · OBC 2024 · 48h](https://ontarioheatloss.ca/heat-loss-tiny-township/): CSA F280 heat loss calculations for Tiny Township building permits at the correct Climate Zone 6 design temperature — BCIN-stamped, accepted by the Township of Tiny Building Department, delivered in 48 hours.
- [Heat Loss Calculation Midland | -24°C Zone 6 · OBC 2024 · 48h](https://ontarioheatloss.ca/heat-loss-midland/): CSA F280 heat loss calculations for Midland building permits at the correct Climate Zone 6 design temperature — BCIN-stamped, accepted by the Town of Midland Building Department, delivered in 48 hours.
- [Heat Loss Calculation Wasaga Beach | -21°C Zone 6 · OBC 2024 · 48h](https://ontarioheatloss.ca/heat-loss-wasaga-beach/): CSA F280 heat loss calculations for Wasaga Beach building permits at the correct Climate Zone 6 design temperature — BCIN-stamped, accepted by the Town of Wasaga Beach Building Department, delivered in 48 hours.
- [Heat Loss Calculation Muskoka Ontario | CSA F280 Zone 6 | BCIN Stamped](https://ontarioheatloss.ca/heat-loss-muskoka/): Building in Muskoka?
- [Heat Loss Calculation Collingwood | -21°C Zone 6 · OBC 2024 · 48h](https://ontarioheatloss.ca/heat-loss-collingwood/): CSA F280 heat loss calculations for Collingwood building permits at the correct Climate Zone 6 design temperature — BCIN-stamped, accepted by the Town of Collingwood Building Department, delivered in 48 hours.
- [Heat Loss Calculation Barrie Ontario | CSA F280 | BCIN Stamped](https://ontarioheatloss.ca/heat-loss-barrie/): Building in Barrie?
- [HVAC Engineering Services Ontario — Heat Loss, Design & Permits](https://ontarioheatloss.ca/services/): Every service we offer is produced by a BCIN-registered HVAC designer, delivered within 48 hours, and built to what Ontario building departments ask for.
- [Cold-Climate Heat Pump Sizing Ontario](https://ontarioheatloss.ca/heat-pump-sizing-ontario/): Installers routinely size heat pumps by square footage — a method that routinely oversizes systems by 30–50% in Ontario.
- [Full HVAC Design & Mechanical Drawings Ontario](https://ontarioheatloss.ca/hvac-design-mechanical-drawings/): Your Ontario building permit application requires more than a heat loss number.
- [Heat Loss Calculation Ontario — CSA F280 for Your Building Permit](https://ontarioheatloss.ca/heat-loss-calculation/): A heat loss calculation works out how much heat your house loses on the coldest day of the year, room by room, so the heating system can be sized to match it.
- [Home](https://ontarioheatloss.ca/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC design for a Grey County building permit](https://ontarioheatloss.ca/hvac-design-grey-county/): Grey County is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC design for a King building permit](https://ontarioheatloss.ca/hvac-design-king-city/): King is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC design for a Penetanguishene building permit](https://ontarioheatloss.ca/hvac-design-penetanguishene/): Penetanguishene publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for a Simcoe County building permit](https://ontarioheatloss.ca/hvac-design-simcoe-county/): Simcoe County is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC design for a The Blue Mountains building permit](https://ontarioheatloss.ca/hvac-design-blue-mountains/): The Blue Mountains will not issue a permit for a new dwelling until the mechanical package is in.
- [HVAC design for a Tiny building permit](https://ontarioheatloss.ca/hvac-design-tiny-township/): Tiny is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC design for a York Region building permit](https://ontarioheatloss.ca/hvac-design-york-region/): York Region is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC design for an Alliston building permit](https://ontarioheatloss.ca/hvac-design-alliston/): Alliston publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for a Bracebridge building permit](https://ontarioheatloss.ca/hvac-design-bracebridge/): Bracebridge publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for a Caledon building permit](https://ontarioheatloss.ca/hvac-design-caledon/): Caledon publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for a Clearview building permit](https://ontarioheatloss.ca/hvac-design-clearview/): Clearview will not issue a permit for a new dwelling until the mechanical package is in.
- [HVAC design for an Elmvale building permit](https://ontarioheatloss.ca/hvac-design-elmvale/): Elmvale publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for a Gravenhurst building permit](https://ontarioheatloss.ca/hvac-design-gravenhurst/): Gravenhurst publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for a Guthrie building permit](https://ontarioheatloss.ca/hvac-design-guthrie/): Guthrie publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for a Hastings building permit](https://ontarioheatloss.ca/hvac-design-hastings/): Hastings publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for a Huntsville building permit](https://ontarioheatloss.ca/hvac-design-huntsville/): Huntsville will not issue a permit for a new dwelling until the mechanical package is in.
- [HVAC design for a Severn building permit](https://ontarioheatloss.ca/hvac-design-severn/): Severn is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC design for a Springwater building permit](https://ontarioheatloss.ca/hvac-design-springwater/): Springwater is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC design for a Tay building permit](https://ontarioheatloss.ca/hvac-design-tay/): Tay is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC design for a Trent Hills building permit](https://ontarioheatloss.ca/hvac-design-trent-hills/): Trent Hills is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [Ontario Design Temperature Lookup (SB-1)](https://ontarioheatloss.ca/design-temperature-lookup/): Replacement for the existing design-temperature tool, which prints Barrie's row for Oro-Medonte and an unsourced value for Innisfil. 39 municipalities, honest 'not listed' answers, logs misses to GA4.
- [Basement Apartment Self-Survey](https://ontarioheatloss.ca/basement-apartment-self-survey/): The guided self-survey form (single-file HTML). No endpoint wired yet: 'Send' shows the JSON. Set window.OHL_INTAKE_ENDPOINT to a form handler or email bridge before publishing.
- [Basement Apartment Heat Loss & Furnace Check](https://ontarioheatloss.ca/basement-apartment-heat-loss/): NEW product page for ADUs / secondary suites. Prices $495 / $795 / +$250 visit / +$95 video, 5 business days — confirm against Trevor's fee before publishing.
- [Commercial HVAC Design in Ontario: Who Can Sign It, and When You Need an Engineer](https://ontarioheatloss.ca/commercial-hvac-design-ontario/): A lot of people search for commercial HVAC design and land on house designers.
- [Heating a Bunkie, Garage or Shop in Ontario: Radiant Slabs, Heaters and Permits](https://ontarioheatloss.ca/heating-bunkie-garage-shop-ontario/): Every builder in cottage country gets this question. "I am pouring a slab for the shop. Do I need tubing? Do I need a permit? How big a heater?"
- [Air-to-Water Heat Pumps in Ontario: Radiant Floors Without a Boiler](https://ontarioheatloss.ca/air-to-water-heat-pump-ontario/): If you love radiant floors and want off gas or propane, an air-to-water heat pump is the obvious question.
- [Electric Boilers for Radiant Floor Heat in Ontario: Sizing Without Eating Your Electrical Service](https://ontarioheatloss.ca/electric-boiler-radiant-floor-ontario/): Electric boilers are simple, quiet and clean. No gas line, no venting, no chimney. They are also the radiant heat source most often bought too big.
- [Radiant Floor Not Heating? Causes and Fixes for In-Floor Heat (Ontario)](https://ontarioheatloss.ca/radiant-floor-not-heating-ontario/): We have been building with radiant floors since the early 1990s. When they are designed right, nothing is more comfortable.
- [Heat Pumps and Your Electrical Panel: Do You Really Need 200 Amps? (Ontario)](https://ontarioheatloss.ca/heat-pump-electrical-panel-ontario/): A lot of heat pump quotes come with a surprise line: service upgrade to 200 amps. That can add thousands of dollars and weeks of waiting for the utility.
- [HVAC Design for Ontario Builders: Permit Packages for Custom Homes and Multiple Lots](https://ontarioheatloss.ca/hvac-design-for-builders-ontario/): Builders do not need another thing to chase. You need the mechanical package done right, done fast, and updated without drama when the client moves a wall.
- [HVAC Design for Contractors in Ontario: BCIN-Stamped Heat Loss and Permit Packages for Your Installs](https://ontarioheatloss.ca/hvac-design-for-contractors-ontario/): You know how to install a system.
- [Range Hood Makeup Air in Ontario: When the 2024 Code Requires It](https://ontarioheatloss.ca/range-hood-makeup-air-ontario/): Somebody wants a 600 CFM range hood over a gas range. Beautiful kitchen.
- [Electric Baseboard Heating in Ontario: Sizing, SB-12 and the Ventilation Everyone Forgets](https://ontarioheatloss.ca/electric-baseboard-heating-design-ontario/): Baseboards look like the simple option. No furnace, no ducts, no gas line.
- [HRV Balancing and Winter Settings in Ontario: Fresh Air Without Drafts or Wet Windows](https://ontarioheatloss.ca/hrv-balancing-ontario/): Most HRVs in Ontario houses are installed, plugged in and never touched again. Some were never balanced.
- [Second Opinion on a Heat Loss Report: Independent Review in Ontario](https://ontarioheatloss.ca/heat-loss-second-opinion-ontario/): You have a heat loss report and something feels off. The number looks huge for the house. Two contractors quote equipment a full size apart.
- [Basement Bulkheads and Duct Routing: Keep Your Ceiling Height (Ontario)](https://ontarioheatloss.ca/basement-bulkheads-duct-routing-ontario/): A basement with a seven-foot ceiling and a bulkhead every four feet feels like a parking garage.
- [How Long Does a Building Permit Take in Ontario? Review Times and Why Files Stall](https://ontarioheatloss.ca/building-permit-review-time-ontario/): The Building Code actually sets deadlines for building departments. For a house it is 10 business days. So why do so many people wait months?
- [Blower Door Tests in Ontario: When SB-12 Requires One and What It Does for Your Heat Loss](https://ontarioheatloss.ca/blower-door-test-ontario/): A blower door test is a big fan in a door frame that pressurizes the house and measures how leaky it is. It sounds like a nice-to-have.
- [Furnace Room Fire Separation and CO Alarms in a Basement Apartment (Ontario)](https://ontarioheatloss.ca/furnace-room-fire-separation-basement-apartment-ontario/): Put a tenant below your living room and the furnace room stops being a storage closet.
- [HVAC Rough-In and Final Inspections in Ontario: What the Inspector Checks](https://ontarioheatloss.ca/hvac-rough-in-inspection-ontario/): The rule is simple: do not cover anything before it has been inspected. Every year somebody learns it with a drywall saw.
- [Return Air in Bedrooms: Why Closed Doors Make Cold Rooms (Ontario)](https://ontarioheatloss.ca/return-air-bedrooms-ontario/): Air cannot go into a room if it cannot get out. Shut a bedroom door with no return path, and the supply duct pushes against a closed box.
- [Geothermal Heat Pump Design in Ontario: Loops, Sizing, Permits and When It Pays](https://ontarioheatloss.ca/geothermal-heat-pump-design-ontario/): Geothermal is the Cadillac of heating. Steady, quiet, efficient on the coldest night of the year.
- [Single-Stage vs Two-Stage vs Modulating Furnace: Which Fits Your Ontario House?](https://ontarioheatloss.ca/two-stage-vs-modulating-furnace-ontario/): Furnace salesmen love this question because the answer they give always costs more.
- [Furnace Sizing Rules of Thumb: 1 Ton per 500 Sq Ft, BTU per Sq Ft and Gas Bills (Ontario)](https://ontarioheatloss.ca/furnace-sizing-rules-of-thumb-ontario/): Every trade has its rules of thumb. Ours include "one ton per 500 square feet," "40 BTU a square foot," and the classic "put in what was there before."
- [Changing Things After the Permit: Windows, Insulation and HVAC Equipment Swaps (Ontario)](https://ontarioheatloss.ca/hvac-changes-after-permit-ontario/): Nobody builds exactly what is on the permit drawings.
- [Triplex and Fourplex HVAC in Ontario: Heating and Ventilation for Three and Four Units](https://ontarioheatloss.ca/triplex-fourplex-hvac-design-ontario/): Ontario now lets you put more units on a lot than ever before.
- [How to Look Up a BCIN in Ontario (QuARTS Registry): Check Your Designer in 2 Minutes](https://ontarioheatloss.ca/bcin-lookup-ontario/): Anybody can type a number on a drawing. The Province of Ontario keeps a free public registry of qualified designers, and checking it takes about two minutes.
- [HRAI vs BCIN in Ontario: Which One Can Sign Your HVAC Design?](https://ontarioheatloss.ca/hrai-vs-bcin-ontario/): Homeowners hear both sets of letters and assume they mean the same thing.
- [Wood Stove Permits in Ontario: Permits, WETT, Tight Houses and HRVs](https://ontarioheatloss.ca/wood-stove-permit-ontario/): Nothing beats wood heat on a cold January night.
- [Switching From Oil, Electric or Propane Heat in Ontario: Permits, Sizing and Rebates](https://ontarioheatloss.ca/switch-oil-electric-to-gas-or-heat-pump-ontario/): Getting off oil or baseboard heat is one of the best money moves an Ontario homeowner can make.
- [Heat Pump Balance Point and Backup Heat in Ontario](https://ontarioheatloss.ca/heat-pump-balance-point-backup-heat-ontario/): Every heat pump has a temperature where it runs out of steam. Not off, just not enough. Above that point it carries your house alone.
- [Turning a Cottage Into a Year-Round Home: Heat Loss, Heating and the Permit](https://ontarioheatloss.ca/cottage-heat-loss-ontario/): A cottage built for July is a different animal in January.
- [Why Is One Room Always Cold? Causes and Real Fixes (Ontario)](https://ontarioheatloss.ca/why-is-one-room-always-cold/): Every house seems to have one. The room over the garage. The bedroom at the end of the hall. The bonus room someone finished in 2004.
- [Will My Existing Ducts Work With a Heat Pump? (Ontario)](https://ontarioheatloss.ca/heat-pump-existing-ductwork-ontario/): Most Ontario houses switching to a heat pump keep the ducts they have. Most of the time that works.
- [SB-12 Energy Efficiency in Ontario: Packages, Paths and the Paperwork](https://ontarioheatloss.ca/sb-12-energy-efficiency-ontario/): Every new Ontario house, and a lot of additions and conversions, has to prove it meets the energy rules before the permit is issued.
- [Ontario Heat Loss Calculator: Your Design Heat Load in 30 Seconds](https://ontarioheatloss.ca/heat-loss-calculator-ontario/): Every heating system in Ontario should be sized from a heat loss calculation — the Building Code requires the full CSA F280 version for permits, and getting it wrong is how furnaces end up 3× oversized and heat pumps end up undersized.
- [EEDS and SB-12 in Ontario: The Energy Compliance Forms Explained](https://ontarioheatloss.ca/energy-efficiency-design-summary-ontario/): If a building department has asked you for an "EEDS," an "SB-12 compliance package," or "energy efficiency documentation," you've hit the least-explained corner of the Ontario permit set.
- [Oversized Furnace Problems: Why Bigger Is Costing You Comfort and Money](https://ontarioheatloss.ca/oversized-furnace-problems-ontario/): One contractor quotes 60,000 BTU. Another says 90,000. A third insists your old 100,000 BTU unit was "sized right for a reason."
- [HRV vs ERV in Ontario: Which One Does Your House Actually Need?](https://ontarioheatloss.ca/hrv-vs-erv-ontario/): Every new Ontario home needs mechanical ventilation, and the choice comes down to two boxes that look identical on the wall: the HRV (heat recovery ventilator) and the ERV (energy recovery ventilator).
- [HVAC Permit Rejected in Ontario? How to Fix a Deficiency Notice in 48 Hours](https://ontarioheatloss.ca/hvac-permit-rejected-ontario/): First: don't panic.
- [Does a Basement Apartment Need Its Own Furnace in Ontario?](https://ontarioheatloss.ca/separate-furnace-basement-apartment-ontario/): Home›Guides›Does a Basement Apartment Need Its Own Furnace?
- [Home Renovation Savings Program Ontario: Heat Pump Rebates, Eligibility and the 2026 Deadline](https://ontarioheatloss.ca/home-renovation-savings-program-ontario/): The Home Renovation Savings Program (HRS) is Ontario's main energy-retrofit rebate program, delivered by Save on Energy (IESO) together with Enbridge Gas — covering heat pumps, insulation, windows, air sealing and more.
- [HVAC design for a Bancroft building permit](https://ontarioheatloss.ca/hvac-design-bancroft/): Bancroft will not issue a permit for a new dwelling until the mechanical package is in.
- [HVAC design for a Brockville building permit](https://ontarioheatloss.ca/hvac-design-brockville/): Brockville publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC Design Brantford](https://ontarioheatloss.ca/hvac-design-brantford/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC Design Windsor](https://ontarioheatloss.ca/hvac-design-windsor/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC Design London](https://ontarioheatloss.ca/hvac-design-london/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC Design Kitchener-Waterloo](https://ontarioheatloss.ca/hvac-design-kitchener-waterloo/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC Design Kingston](https://ontarioheatloss.ca/hvac-design-kingston/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC Design Ottawa](https://ontarioheatloss.ca/hvac-design-ottawa/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC Design Hamilton](https://ontarioheatloss.ca/hvac-design-hamilton/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC Design Northern Ontario | Sudbury, North Bay, the Sault & Thunder Bay](https://ontarioheatloss.ca/hvac-design-northern-ontario/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC design for a Belleville building permit](https://ontarioheatloss.ca/hvac-design-belleville-quinte/): Belleville will not issue a permit for a new dwelling until the mechanical package is in.
- [HVAC Design Guelph & Cambridge | Permit Packages Done Right](https://ontarioheatloss.ca/hvac-design-guelph-cambridge/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC Design Niagara | St. Catharines, Niagara Falls & Welland](https://ontarioheatloss.ca/hvac-design-niagara/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC Design Oakville, Burlington & Milton | Halton Permit Packages](https://ontarioheatloss.ca/hvac-design-oakville-burlington-milton/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC Design Mississauga & Brampton | Peel Region Permit Packages](https://ontarioheatloss.ca/hvac-design-mississauga-brampton/): Upload your floor plans today. Get a firm quote in 24 hours.
- [How to Heat a Legal Basement Apartment in Ontario: 5 Options Compared](https://ontarioheatloss.ca/basement-apartment-heating-options-ontario/): The Ontario Building Code gives you one non-negotiable for a legal second suite: the tenant controls their own heat.
- [Legal Basement Apartment Requirements Ontario: The Complete 2026 Checklist](https://ontarioheatloss.ca/legal-basement-apartment-checklist-ontario/): Ontario building departments don't reject basement apartment applications for mysterious reasons — they reject them for the same handful of missing items, over and over.
- [How Much Does a Legal Basement Apartment Cost in Ontario? | 2026 Breakdown](https://ontarioheatloss.ca/legal-basement-apartment-cost-ontario/): Most Ontario homeowners budget for drywall and a kitchenette, then discover the real cost drivers of a legal second suite are the things you can't see: fire separation, egress, and the mechanical systems the Ontario Building Code requires.
- [HVAC design for a Kawartha Lakes building permit](https://ontarioheatloss.ca/hvac-design-kawartha-lakes/): Kawartha Lakes is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [HVAC Design Whitby, Ajax & Pickering | Durham West Permit Packages](https://ontarioheatloss.ca/hvac-design-whitby-ajax-pickering/): Upload your floor plans today. Get a firm quote in 24 hours.
- [HVAC design for a Toronto (City Hall) building permit](https://ontarioheatloss.ca/hvac-design-toronto/): Toronto (City Hall) publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for a Campbellford building permit](https://ontarioheatloss.ca/hvac-design-campbellford/): Campbellford publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for a Cobourg building permit](https://ontarioheatloss.ca/hvac-design-port-hope-cobourg/): Cobourg publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for an Oshawa building permit](https://ontarioheatloss.ca/hvac-design-oshawa/): Oshawa publishes no mechanical checklist, which means the requirement usually arrives after you have applied.
- [HVAC design for a Clarington building permit](https://ontarioheatloss.ca/hvac-design-clarington/): Clarington is not one of the municipalities listed in SB-1, so the outdoor design temperature for your calculation is not a number you can simply look up.
- [Heat Loss Calculation Windsor | CSA F280 at -16°C](https://ontarioheatloss.ca/heat-loss-windsor/): CSA F280 heat loss calculations for Windsor building permits, at the correct OBC design temperature for Essex County — BCIN-stamped, accepted by the City of Windsor Building Division, delivered in 48 hours.
- [Heat Loss Calculation Kingston | CSA F280 at -22°C](https://ontarioheatloss.ca/heat-loss-kingston/): CSA F280 heat loss calculations for Kingston building permits, at the correct OBC design temperature for Eastern Ontario on Lake Ontario — BCIN-stamped, accepted by the City of Kingston Building Division, delivered in 48 hours.
- [Heat Loss Calculation Kitchener-Waterloo | CSA F280 at -19°C](https://ontarioheatloss.ca/heat-loss-kitchener-waterloo/): CSA F280 heat loss calculations for Kitchener-Waterloo building permits, at the correct OBC design temperature for Waterloo Region — BCIN-stamped, accepted by the Kitchener and Waterloo building departments, delivered in 48 hours.
- [Heat Loss Calculation London | CSA F280 at -18°C](https://ontarioheatloss.ca/heat-loss-london/): CSA F280 heat loss calculations for London building permits, at the correct OBC design temperature for Southwestern Ontario — BCIN-stamped, accepted by the City of London Building Division, delivered in 48 hours.
- [Heat Loss Calculation Hamilton | CSA F280 at -17°C](https://ontarioheatloss.ca/heat-loss-hamilton/): CSA F280 heat loss calculations for Hamilton building permits, at the correct OBC design temperature for the Golden Horseshoe — BCIN-stamped, accepted by the City of Hamilton Building Division, delivered in 48 hours.
- [Heat Loss Calculation Ottawa | CSA F280 at -25°C](https://ontarioheatloss.ca/heat-loss-ottawa/): CSA F280 heat loss calculations for Ottawa building permits, at the correct OBC design temperature for Eastern Ontario — BCIN-stamped, accepted by the City of Ottawa Building Code Services, delivered in 48 hours.
- [Do You Need a Permit to Finish a Basement in Ontario?](https://ontarioheatloss.ca/basement-finishing-permit-ontario/): Finishing a basement touches framing, electrical, and often plumbing and heating — so it usually needs a permit.
- [Hydronic vs Forced Air Heating in Ontario](https://ontarioheatloss.ca/hydronic-vs-forced-air-ontario/): Two good systems, two very different feels.
- [What Size Furnace Do I Need in Ontario?](https://ontarioheatloss.ca/furnace-sizing-ontario/): Most Ontario furnaces are far bigger than the home needs.
- [Manual J vs CSA F280 in Canada: Which Load Calculation Do You Need?](https://ontarioheatloss.ca/manual-j-vs-csa-f280-canada/): If a U.S.-based tool or contractor hands you a "Manual J," it is the right idea but the wrong standard for an Ontario permit.
- [Do You Need a Permit for Air Conditioning in Ontario?](https://ontarioheatloss.ca/air-conditioning-permit-ontario/): Adding or replacing central air raises two separate permit questions in Ontario — a building/mechanical permit and an ESA electrical permit — and the answer depends on the scope of the work and your municipality.
- [Ontario HVAC Permit Questions, Answered](https://ontarioheatloss.ca/ontario-hvac-permit-questions/): Straight answers to the 100 questions Ontario homeowners, self-builders, and contractors ask most about heat loss calculations, HVAC permits, heat pumps, HRV/ERV ventilation, radiant heating, and BCIN paperwork — all under OBC 2024.
- [Heating Design Temperature in Ontario? | OBC Climatic Data](https://ontarioheatloss.ca/what-is-design-temperature-ontario/): Home›Guides›What Is Heating Design Temperature?

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