A space heater bought at the hardware store on a Tuesday and returned by Thursday. That is the most common garage-heating purchase in this city, and almost every time, the reason is the same: it was the wrong type for an uninsulated space, or it was sized for a bedroom instead of a 24-by-24 double garage sitting at minus twenty. Get the type and the sizing right the first time and a Calgary garage holds a workable temperature through January without a five-figure heating bill attached to it.
Insulation Comes Before Any Heater Decision
Most detached garages in Calgary were framed with the same 2×4 walls as the house next to them, then never insulated because nobody plans to spend real time out there. Uninsulated stud bays lose heat almost as fast as a heater can put it in. Walls sitting at R-12 and a ceiling at R-20 change that math completely. That is roughly the difference between a heater running most of the day and one that cycles off after twenty minutes and holds.
Skip the insulation step and even the biggest unit heater on the market fights a losing battle against an open-frame wall on a windy February night. Insulation is cheap compared to the gas bill of a garage that leaks heat through every stud bay for a decade. Batts and a vapour barrier in an unfinished double garage typically run a few hundred dollars in materials, done over a weekend. Book the insulation upgrade and a Calgary garage heater installation together, and the contractor can size the heater against the finished wall assembly instead of guessing at what the garage will look like once it is closed up.
Unit Heaters vs Radiant: What Each Actually Does
Two real options exist for a Calgary garage, and they solve different problems.
Forced-air unit heaters push warm air through the whole space and hold it there, the same way a furnace holds a house at temperature. They work best in an insulated garage where the goal is a comfortable ambient temperature for working, storing paint that cannot freeze, or parking a vehicle somewhere above zero. Natural gas unit heaters in the 30,000 to 60,000 BTU range cover most double garages, and running one off the home’s existing gas line keeps operating cost close to furnace-level pricing rather than electric-heater pricing.
Radiant or infrared heaters warm objects and people directly, not the air around them. That makes them the better call in a garage that stays uninsulated or gets left open for long stretches, since they do not waste output heating air that is about to escape through a gap under the door. A mechanic working under a car for twenty minutes stays warm under a radiant unit even if the ambient air temperature barely moves. The trade-off: walk out of the heater’s direct throw and the warmth disappears fast.
Electric heaters of either type cost more to run in Calgary than gas, sometimes by a wide margin over a full winter. A 5,000-watt electric unit heater running several hours a day through January adds up fast against Alberta’s electricity rate. Homeowners without an existing gas line to the garage sometimes choose electric anyway, purely because running one is simpler than running a new line. Whether that trade-off makes sense depends on how many hours a week the garage actually gets used, and it is worth pricing out a gas-fired garage heater install before assuming electric is the easier or cheaper path.
Venting and the Gas Line Nobody Budgets For
A natural gas unit heater needs a flue to the outside, and that flue needs to be sized and positioned correctly, not just drilled through the nearest wall. Combustion byproducts have to leave the building, and a garage sealed up tight for winter is exactly the kind of space where a venting mistake turns dangerous fast. Carbon monoxide does not announce itself with a smell. Alberta’s Safety Codes Act requires a licensed gas fitter for this work, full stop. That rule exists because garage heater installs are one of the more common places DIY gas work goes wrong: an undersized vent, a termination too close to a window or soffit, a gas line run without a proper pressure test. None of that shows up as a problem on day one. It shows up months later.
Running the gas line itself is often the bigger cost than the heater. A garage sitting 40 or 50 feet from the meter, on the far side of the yard, means trenching or running the line through the house structure, and that can rival or exceed the price of the heater it feeds. Get a quote for the full job, line included, before treating a $600 unit heater as a $600 project.
Sizing a Garage Heater for Calgary Cold
The rough rule most installers use: roughly 45,000 to 60,000 BTU for an insulated double garage in this climate, adjusted up for ceiling height and down if the garage is well sealed with a newer overhead door. That number assumes Calgary’s real winter design temperature, not the milder national average some online BTU calculators are built around. A heater sized off a US chart undersizes a Calgary garage more often than it should.
Oversizing wastes money in a different way than undersizing does. A unit heater too large for the space short-cycles, firing on and off in bursts that wear the ignitor and heat exchanger faster over the years, the same problem that shortens a furnace’s working life inside the house. Right-sized equipment, correctly vented, against a properly insulated shell: that combination keeps a Calgary garage usable through a cold snap without becoming a second heating bill nobody planned for.
What Wastes Money
Buying the heater before insulating wastes money. Sizing off a chart built for a different climate wastes money. Skipping the gas fitter to save a few hundred dollars on the install risks a lot more than money. And running an electric heater for daily use in a garage that could have supported a gas line from the start quietly costs the difference every single winter, whether anyone adds it up or not.
Calgary Air Heating and Cooling Ltd Contact Information
Address
95 Beaconsfield Rise NW, Calgary, AB T3K 1X3
Phone
+1 (403) 720-0003
Hours of operation
7 a.m.–11 p.m. (including weekends)
Website
https://calgaryair.ca/garage-heaters-installation/
Map
Most garages in this city get one heating decision made for them and live with it for fifteen years, right or wrong. Worth taking the extra week to get it right the first time.