Heat Loss Calculation 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.
An Aurora building permit requires a CSA F280 heat loss calculation at Aurora OBC January 2.5% design temperature of -21°C (Supplementary Standard SB-1) — Climate Zone 6, colder than Toronto and the GTA at -18°C, so GTA assumptions undersize equipment. We deliver a BCIN-stamped report with the MVDS and Schedule 1, submitted to the Town of Aurora. From $395, delivered in 48 hours.
Aurora design temperature: -21°C (Zone 6)
Under OBC Section 9.33.2.2, your CSA F280 calculation must use Aurora official January 2.5% heating design temperature from Supplementary Standard SB-1: -21°C, Climate Zone 6. Aurora is colder than Toronto and the lakeshore GTA (-18°C) — a common assumption that undersizes equipment by sizing for a milder day than Aurora actually sees. Using the wrong design temperature is the most frequent reason heat loss reports are returned, so we confirm the SB-1 value for your project before calculating. Check yours with our free design temperature lookup.
What an Aurora permit package needs
A complete Aurora building permit package includes a CSA F280 heat loss report at -21°C, mechanical drawings (duct or hydronic layout and equipment schedule), the MVDS ventilation summary (mandatory under OBC 2024), and the Schedule 1 designer declaration — every page BCIN-stamped. Standard residential new construction submits directly to the Town of Aurora Building Division. See our permit requirements guide and the Aurora HVAC design page.
Heat pumps and equipment sizing at -21°C
At Aurora -21°C design day, a cold-climate (CCASHP) heat pump typically delivers roughly 65-75% of its rated capacity — less than at the GTA -18°C, so the unit must be checked against the calculated load at -21°C, not the nameplate. All-electric is viable for well-insulated homes, but backup heat is more often appropriate here than in the milder GTA. The room-by-room CSA F280 at -21°C is the document that confirms the right size; see our cold climate heat pump guide.
| Area | Design Temp | Zone |
|---|---|---|
| Toronto / GTA | -18°C | 5 |
| Aurora | -21°C | 6 |
| Newmarket | -22°C | 6 |
| Barrie | -24°C | 6 |
Heat Loss Calculations in Aurora — FAQ
What design temperature is used for a heat loss calculation in Aurora?
Aurora uses an OBC January 2.5% heating design temperature of -21°C (Climate Zone 6), from Supplementary Standard SB-1 — colder than Toronto and the GTA at -18°C. Your CSA F280 calculation and equipment sizing must use -21°C.
How much does a heat loss calculation cost in Aurora, and how fast?
Our certified CSA F280 reports start at $395 flat, BCIN-stamped, with a firm quote within 24 hours of uploading plans and delivery within 48 hours of payment. A full HVAC design package with mechanical drawings starts at $695.
Can a cold-climate heat pump heat an Aurora home?
Yes, for well-insulated homes — but at -21°C a CCASHP delivers roughly 65-75% of rated capacity, so its output must be compared to the CSA F280 load at -21°C, and backup heat is more often appropriate than in the milder GTA.
Is the Aurora permit submitted to York Region or the Town?
To the Town of Aurora Building Division directly. York Region does not process residential building permits. Note neighbouring Newmarket is slightly colder at -22°C; both are Zone 6.
Related Services & Guides
Building in Aurora? Heat loss report in 48 hours.
Upload your plans and we confirm Aurora SB-1 design temperature (-21°C, Zone 6), produce the BCIN-stamped CSA F280 and full permit package, and format it for the Town of Aurora.
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