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Calgary Garage Heater Sizing Guide
Right-sizing matters more than brand. An undersized heater never catches up on a cold morning; an oversized one short-cycles and wastes gas. Use this as a starting point — we confirm the exact BTU on site.
- Single garage (350–450 sq ft): 30,000–45,000 BTU
- Standard double garage (450–600 sq ft): 45,000–60,000 BTU
- Triple garage or 9 ft ceilings (700–900 sq ft): 60,000–75,000 BTU
- Heated workshop (900–1,200 sq ft): 75,000–100,000 BTU
- Insulated shop (1,500+ sq ft): 100,000–150,000 BTU
- Uninsulated detached garage: add ~25% to recommended BTU
- Tall ceiling (12 ft+): add ~15% to recommended BTU
- Concrete-floor cold-soak: add a programmable setback thermostat
Request an On-Site Sizing Visit
We'll measure the space, check insulation and access, and give you a written quote that covers the unit, gas, vent, and electrical — all-in.
How a Permitted Garage Heater Install Works
A garage heater is a gas appliance — installation has to be done right or the manufacturer warranty (and your home insurance) is void. Here's the proper sequence.
Heat-Load Sizing
We measure square footage, ceiling height, and insulation, then run a Manual J style calculation so the unit isn't oversized or undersized for your space.
Gas, Vent & Electrical
Our licensed Alberta gas fitters run new lines, set venting clearances, and connect the thermostat — pulling permits where the city requires them.
Commissioning & Walkthrough
We test combustion, set the thermostat to your usage pattern, and walk you through filter changes, seasonal shut-down, and warranty registration.
Typical install time
Reznor warranty
Thermal efficiency
Garages heated
Garage Heater Installation FAQs
Common questions about garage heater installation in Calgary.
Heating Tips & Advice
Stay informed with the latest tips on keeping your home comfortable year-round.
No Heat? A Calgary Homeowner's Emergency Furnace Troubleshooting Checklist
Furnace stopped working in the middle of a Calgary cold snap? Walk through this safety-first troubleshooting checklist before your technician arrives — most no-heat calls come down to a tripped switch, a dead thermostat battery, or a clogged filter.
June 29, 2026
Cold-Climate Heat Pump Performance at -30°C in Calgary
Real-world expectations for cold-climate heat pumps in Calgary — capacity at -30°C, when to switch to gas, and why dual-fuel almost always wins here.
May 13, 2026
Goodman vs. Lennox vs. Carrier: Which Furnace Wins for Calgary?
A field-tested Calgary comparison of the three most-installed furnace brands — efficiency, durability, parts availability, warranty, and which brand fits which home.
May 13, 2026