Ontario · Energy · area guide · checked October 8, 2026

Heat loss calculations in Simcoe County

A heat loss calculation is how a heat pump or furnace gets sized, and its key input is the design temperature. In Simcoe County, the National Building Code's 2.5% January design temperatures run from −21°C at Collingwood to −24°C at Elmvale, so a calculation for a house near Elmvale starts from a colder number than one near Collingwood. Here's what that means for Innisfil, Bradford and Alliston and the rest of the area.

Get matched in Simcoe County → The CSA F280 heat-loss calculation
A kitchen table with a house floor plan, a laser measure, a tape measure and a laptop showing the plan

Design temperature

−21°C to −24°C

NBC 2020, January 2.5%

Heating degree-days

4,254

Barrie WPCC

Standard

CSA F280-12

Registered organizations

28

many offer F280 reports

How Simcoe County is built

Simcoe County's houses by when they were built Ten house shapes, one for each tenth of Simcoe County's 122,485 houses. Before 1961: 16%, 1961–1990: 36%, 1991–2000: 13%, 2001 or later: 34%. Older houses glow hotter.
  • Before 1961 16%
  • 1961–1990 36%
  • 1991–2000 13%
  • 2001 or later 34%
Each house stands for one in ten of Simcoe County's 122,485 houses (single-detached, semi-detached, row, duplex and mobile homes), drawn by when it was built. The glow shows the usual pattern: older houses tend to be leakier and less insulated. Snowfall scales with heating degree-days. Sources: Statistics Canada 2021 Census (table 98-10-0233-01), Environment and Climate Change Canada 1981–2010 climate normals (Barrie WPCC) and the National Building Code 2020 January design temperature for Alliston.

This page covers the 16 towns and townships of the County of Simcoe. Barrie and Orillia are separate cities that aren't part of the county government; Barrie has its own pages. The District of Muskoka, north of the county, has its own section below.

Design temperatures across Simcoe County

The National Building Code of Canada 2020 says the 2.5% January design temperature is the value ordinarily used to design heating systems. Its climate table lists these Ontario locations in or next to Simcoe County:

Location in the code’s tableJanuary 2.5% design temperatureHeating degree-days
Alliston−23°C4,200
Bradford−23°C4,280
Collingwood−21°C4,180
Elmvale−24°C4,200
Midland−24°C4,200
Penetanguishene−24°C4,200
Borden (CFB)−23°C4,300

In the District of Muskoka, the table gives −26°C for Bracebridge, −26°C for Gravenhurst and −26°C for Huntsville.

Environment and Climate Change Canada's 1981–2010 climate normal at Barrie WPCC (8.9 km from the middle of the area) is 4,254 heating degree-days a year, with a January mean of −7.7°C. At Muskoka Airport, 10.9 km from Bracebridge, the normal is 4,786 heating degree-days, with a January mean of −10.3°C.

What CSA F280-12 asks for

The code requires the heating capacity for a house to be worked out with CSA F280, using the code's own design temperatures, and its list of referenced documents names the 2012 edition, CSA F280-12. The calculation works out how much heat each room loses on the design day, from the house's actual walls, windows, ceiling insulation and air leakage.

At −21°C to −24°C, a cold-climate heat pump sized to the calculation can carry most of the season, and the number shows how much backup heat the coldest days need.

What the calculation needs from your house

Of the 122,485 houses in Simcoe County (single-detached, semi-detached, row houses, duplexes and mobile homes), 16% were built before 1961 and 52% before 1991, according to the 2021 Census. In an older or renovated house, the walls, windows and air leakage rarely match the original plans, so ask the designer to measure rather than assume. Have this ready:

  • Room dimensions and ceiling heights, or a floor plan.
  • Window and door sizes and types, room by room.
  • Insulation levels in the attic, walls, basement and any floor over an unheated space.
  • A blower door result from an EnerGuide evaluation, if you've had one.
  • Where the ducts, radiators or baseboards run, so the heat can be delivered room by room.

What it costs

There's no standard published price for a standalone F280 calculation, so ask two or three providers for a written quote that names the deliverable: the room-by-room F280 report, not just an equipment size. Many energy advisors bundle it with an EnerGuide evaluation, which also gives the calculation measured air-leakage data instead of an assumption. Ask whether a rural travel fee applies. The CSA F280 heat-loss calculation explains the method and typical cost bands.

Communities we cover in Simcoe County

Every town, village and hamlet below is part of this page, grouped by municipality (2021 Census population).

  • Town of New Tecumseth 43,948Alliston, Beeton, Tottenham
  • Town of Innisfil 43,326Bell Ewart, Big Bay Point, Cookstown, Gilford, Lefroy, Stoney Point
  • Town of Bradford West Gwillimbury 42,880Bond Head, Bradford
  • Town of Wasaga Beach 24,862
  • Town of Collingwood 24,811
  • Township of Oro-Medonte 23,017Hawkestone, Horseshoe Valley, Oro, Oro Station, Shanty Bay, Warminster
  • Township of Essa 22,970Angus, CFB Borden, Egbert, Thornton, Utopia
  • Township of Springwater 21,701Elmvale, Midhurst, Minesing, Phelpston
  • Town of Midland 17,817
  • Township of Clearview 14,814Creemore, Duntroon, Nottawa, Singhampton, Stayner
  • Township of Severn 14,576Amigo Beach, Bass Lake, Coldwater, Marchmont, Port Severn
  • Township of Tiny 12,966Wyebridge
  • Township of Tay 11,091Port McNicoll
  • Township of Adjala-Tosorontio 10,989Everett, Glencairn, Lisle, Loretto, Rosemont
  • Township of Ramara 10,377Longford Mills
  • Town of Penetanguishene 10,077

District of Muskoka

  • Town of Huntsville 21,147
  • Town of Bracebridge 17,305
  • Town of Gravenhurst 13,157
  • Township of Muskoka Lakes 7,652
  • Township of Lake of Bays 3,759
  • Township of Georgian Bay 3,441

Covered on city pages: Barrie.

NRCan-registered service organizations serving Simcoe County

NRCan's list of service organizations (checked October 8, 2026) shows 28 organizations registered for postal codes in Collingwood, Wasaga Beach, Midland, Penetanguishene, Bradford, Innisfil and Alliston (L9Y, L9Z, L4R, L9M, L3Z, L9S, L9R). Registration means an organization lists those postal areas, not that it has an advisor in town: confirm they travel to your community, and ask about wait times and travel fees.

Only assessments from the seven HRSP-approved organizations qualify for the $600 Home Renovation Savings rebate and its assessment-path upgrade rebates; each listing below says whether it's one of them.

Source: NRCan list of service organizations, checked October 8, 2026, matched by forward sortation area (L9Y, L9Z, L4R, L9M, L3Z, L9S, L9R). Call to confirm your road is covered.

Heat pump programs in Simcoe County

Provincial · needs an evaluation Home Renovation Savings — Home Energy Assessment path Up to $10,000 per home ($5,000 if heated with Enbridge gas), including $600 back on your two assessments, for insulation, windows, air sealing and more — if the follow-up assessment is done by December 31, 2026 Open · deadline Provincial Home Renovation Savings — direct rebates (no assessment) Heat pumps up to $7,500 ($12,000 ground-source), solar with battery up to $10,000, plus attic, thermostat and appliance rebates — no assessment needed Open Federal National Heat Pump Rebate Announced October 8, 2026 and opening early 2027: up to $10,000 below the median income, $2,000 for other eligible homeowners Announced · opens 2027 Federal CMHC Eco Improvement premium refund A 25% energy-efficiency rebate on your CMHC mortgage insurance premium after $20,000 of energy renovations Open

Heat loss calculations in Simcoe County: common questions

What design temperature is used for heat pump sizing in Innisfil?

The National Building Code 2020's climate table gives −23°C for Alliston, −23°C for Bradford, −21°C for Collingwood, −24°C for Elmvale, −24°C for Midland, −24°C for Penetanguishene and −23°C for Borden (CFB). Provincial codes can use their own climate tables, so ask which value the calculation uses.

What is CSA F280-12?

The 2012 edition of CSA F280, Determining the required capacity of residential space heating and cooling appliances. The National Building Code 2020 requires heating capacity for a house to be determined with it.

How much does a heat loss calculation cost?

There is no standard published price. Ask two or three providers for a written quote for the F280 report, and ask whether it costs less bundled with an EnerGuide evaluation and whether a travel fee applies.

Who does F280 calculations in Simcoe County?

Many of the 28 NRCan-registered organizations that list Collingwood, Wasaga Beach and Midland postal codes offer them, as do HVAC designers. Ask for the F280 report itself, not just an equipment size.

Sources

Checked October 8, 2026. Census figures are 2021 totals for the municipalities listed; the climate normal is Environment and Climate Change Canada's station Barrie WPCC (8.9 km from the area's centre point).

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