HVAC Design Oshawa — Permit-Ready Mechanical Packages. CSA F280 at -20°C. BCIN-Stamped. 48 Hours.
Upload your floor plans today. Get a firm quote in 24 hours. Receive your BCIN-stamped CSA F280 heat loss report, HVAC design & mechanical drawings — calculated at Oshawa’s -20°C design temperature and accepted across Durham Region.
Oshawa Is -20°C. Toronto Is -18°C. Plans Examiners Know the Difference.
Contractors coming east from the GTA routinely carry the -18°C habit with them — and the City of Oshawa’s plans examiners routinely catch it. If your heat loss calculation was run at the wrong design temperature, expect the application back. Every Oshawa package we deliver is calculated at the correct SB-1 value.
GTA Default (-18°C)
Two degrees doesn’t sound like much — until it’s the difference between a system that holds temperature on design day and one that doesn’t. Undersized equipment fails when you need it most.
Undersized & flaggedContractor Rule of Thumb
“About 45 BTU per square foot” oversizes most modern Oshawa homes by 30–50%. Oversized furnaces short-cycle, wear out early, and cost more to buy and to run.
Oversized & wastefulCSA F280 at -20°C
Room-by-room load at Oshawa’s actual SB-1 design temperature with your real envelope. BCIN-stamped, MVDS and Schedule 1 included — the package the permit office expects.
Accepted first submissionExactly What Oshawa’s Building Services Expects to See
New builds, legal basement apartments — one of Ontario’s most active second-suite markets — heat pump conversions with rebate paperwork, and additions where the existing furnace’s spare capacity has to be proven, not guessed.
Room-by-Room CSA F280 Heat Loss & Gain
Every room calculated separately at Oshawa’s -20°C design temperature — walls, windows, ceiling, floor, infiltration.
Equipment Sizing Sheet
Right-sized furnace, heat pump, boiler, or AC matched to the calculated load — not a square-footage guess.
Duct or Hydronic Layout Drawings
Fully dimensioned supply and return layout with airflow for every room per HRAI standards.
MVDS & Ventilation Design
The Mechanical Ventilation Design Summary — mandatory on every Ontario new-home permit since January 1, 2025 — plus HRV/ERV selection.
Schedule 1 & BCIN Stamp on Every Page
Signed designer declaration and BCIN stamp throughout — exactly what the City of Oshawa requires before issuing your permit.
Main dwelling and basement suite are calculated as separate loads with independent control — the requirement that catches most second-suite applications in Durham.
Serving Oshawa & All of Durham Region
One design standard covers the region, but design temperatures shift as you move east and north — Pickering and Ajax sit close to Toronto’s value, Oshawa and Whitby at -20°C, Clarington similar. We calculate at your municipality’s SB-1 value and format the package for your building department.
Converting to a cold-climate heat pump? Rebate programs require certified CSA F280 sizing, and we verify CCASHP output at -20°C — the real capacity on design day, not the nominal rating on the box.
Only Need the Heat Loss Report?
The full HVAC design package is $695 flat. If your project only requires the certified CSA F280 heat loss calculation at Oshawa’s -20°C, that’s $395 — same 48-hour delivery.
→ Order a certified heat loss calculationHVAC Design & Permits in Oshawa — Answers Before You Ask
The questions Oshawa homeowners and builders ask most — answered in plain language.
Does a furnace replacement in Oshawa need a permit?
A true like-for-like swap usually doesn’t. Change the fuel, the capacity, or the ductwork — or convert to a heat pump — and it does, with BCIN-stamped documentation. When a furnace replacement needs a BCIN →
What does a legal basement apartment in Oshawa require for HVAC?
A separate heat loss calculation for the suite, independently controlled heating (extending the upstairs furnace does not comply), an MVDS, and a BCIN-stamped package. Full requirements guide →
Can you size a cold-climate heat pump for Oshawa rebates?
Yes — rebate programs require certified CSA F280 sizing. We verify the CCASHP’s published output at -20°C against your calculated load and document the backup heat, which is exactly what the rebate paperwork needs.
Do you cover Whitby, Ajax and Pickering too?
Yes — same package, calculated at each municipality’s own SB-1 design temperature and formatted for its building department. Durham-wide, 48-hour delivery.
Upload Your Plans. Oshawa Permit Package in 48 Hours.
Get the certified CSA F280 heat loss and mechanical drawings the City of Oshawa requires — calculated at the correct -20°C, with MVDS and Schedule 1 included.
- Free quote — no commitment to buy
- CSA F280 at Oshawa’s correct -20°C design temperature
- MVDS and Schedule 1 included
- BCIN-stamped on every page
- 48-hour delivery after payment