How many BTUs per square foot do you need to heat a home in Canada?

As an approximate planning rule of thumb in Canada: mild coastal climates (Vancouver, Victoria) typically require ~20–30 BTU/hr per sq ft; moderate climates (Toronto, Southern Ontario, Halifax) require ~35–50 BTU/hr per sq ft; and cold Prairie climates (Calgary, Edmonton, Winnipeg, Saskatoon) require ~45–65 BTU/hr per sq ft depending on insulation and airtightness. Final sizing must always use a CSA F280-12 or Manual J load calculation.

How do you convert cooling BTUs to air conditioner or heat pump tonnage?

One ton of air conditioning or heat pump cooling capacity equals 12,000 BTU/hr. Divide your estimated cooling BTU/hr load by 12,000 to find the required equipment size in tons (for example, 30,000 BTU/hr = 2.5 Tons).

Back to All Free ToolsBuildric Utility · HVAC Sizing · Canadian Climate Presets

Canadian HVAC BTU Calculator — Heating & Cooling Load by City

Estimate preliminary heating and cooling BTU/hr loads, high-efficiency furnace input sizing (96% AFUE), and heat pump / air conditioner tonnage (Tons) across Canadian climate zones (Calgary, Edmonton, Winnipeg, Toronto, Montreal, Vancouver, Halifax).

1. Climate Zone, Area & Building Envelope

Canadian City / Climate Zone Preset

Zone: Cold (Zone 7A · -30°C Design) · Base Reference: ~45–65 BTU/hr·ft² heating (approximate planning estimate only)

Area Unit

Conditioned Area (ft²)

Avg Ceiling Height (ft)

Building / Space Type

Insulation & Airtightness

Solar Orientation / Window Gain

Furnace Efficiency Rating (AFUE %)

PRELIMINARY HVAC HEATING & COOLING ESTIMATE

Chinook Air & Heating Mechanical Ltd.

Property: 142 Mahogany Blvd SE, Calgary, AB · Calgary / Southern Alberta (Cold Chinook Zone)

Conditioned Area2,100 ft² (195 m²)9 ft Ceilings · AVERAGE Envelope

Winter Heating Load

123,000 BTU/hr

Furnace Input (96% AFUE): ~128,000 BTU/hr

Effective Factor: 58.5 BTU/hr·ft²

Summer Cooling / AC Load

48,000 BTU/hr

Approx. Equipment Size: 4.0 Tons (1 Ton = 12,000 BTU)

Effective Factor: 22.8 BTU/hr·ft²

Sizing Parameters & Canadian Climate Reference

Climate Zone & Design Temp	Cold (Zone 7A · -30°C Design)
Regional Baseline Reference	~45–65 BTU/hr·ft² heating
Envelope & Space Multipliers	Insulation 1x · Space 1x · Ceiling 1.13x
Recommended Heat Pump / AC Tonnage	4.0 Ton System (48,000 BTU/hr)

IMPORTANT ENGINEERING DISCLAIMER: This document provides an approximate planning estimate only based on square-footage rules of thumb. It does NOT replace a room-by-room CSA F280-12 (Canada) or ACCA Manual J heat loss and heat gain calculation required for building permits and final equipment selection.

Generated by Alberta Studio — Free Tools · albertastudio.devApproximate planning estimate only · Verify with CSA F280

Export Preliminary HVAC Sizing Report (PDF)

Share with homeowners during initial consultation calls.

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Engineering Disclaimer: Approximate planning estimate only. Does not replace a certified CSA F280-12 or ACCA Manual J / Manual S load calculation performed by a qualified HVAC designer.