What is the best way to heat a detached garage in Moncton New Brunswick?

The best heating option for a detached garage in Moncton depends on how you use the space, but for most homeowners a natural gas or propane unit heater is the most practical and cost-effective choice, providing fast heat-up, reliable performance in Moncton's cold winters, and reasonable operating costs. If your garage is well-insulated and you want year-round climate control, a mini-split heat pump is increasingly popular and offers both heating and cooling with excellent energy efficiency.

Moncton's climate is a key factor in this decision. With roughly 4,800 heating degree days per year, winter temperatures regularly reaching -20 to -25 degrees Celsius, and the heating season stretching from October through April, you need a system that can handle sustained cold without excessive fuel costs. The Greater Moncton area has good access to natural gas through Enbridge, which gives homeowners in Moncton, Dieppe, and Riverview a cost advantage over communities that rely solely on propane, oil, or electricity.

Natural gas or propane unit heaters are the most popular choice for detached garages in the Moncton area. These are ceiling-mounted or wall-mounted forced-air units that heat the garage quickly and run on relatively inexpensive fuel. A 30,000 to 75,000 BTU unit heater handles most two-car garages, with the exact size depending on insulation levels, ceiling height, and your target temperature. Installation costs run $1,500 to $3,500 including the heater, gas line, venting, and labour. Operating costs for a natural gas unit in Moncton are roughly $80 to $200 per month during peak winter if you maintain the garage at workshop temperatures (10 to 15 degrees Celsius). These units are simple, reliable, and provide heat within minutes of firing up — ideal for garages that are used intermittently rather than heated continuously.

One critical requirement: gas-fired heaters in garages must be installed with the burner at least 8 feet above the floor (or otherwise protected from flammable vapours) per code requirements, since gasoline vapours are heavier than air and collect at floor level. They also require proper venting to the exterior — never use an unvented gas heater in a garage. All gas appliance installation in NB must be done by a licensed gas fitter.

Mini-split heat pumps are an increasingly attractive option for Moncton garages, especially for homeowners who want efficient year-round climate control. Modern cold-climate mini-splits (Mitsubishi Hyper-Heat, Fujitsu XLTH, and similar models) operate effectively down to -25 to -30 degrees Celsius, which covers Moncton's winter extremes. A single-zone mini-split sized for a two-car garage (18,000 to 24,000 BTU) costs $3,500 to $6,000 installed. The operating cost advantage is significant — heat pumps deliver 2 to 3 times more heat energy per dollar than electric resistance heaters and are competitive with natural gas on a cost-per-BTU basis. They also provide cooling and dehumidification in summer, which is a bonus for workshop use. The drawback is slower heat-up time compared to a gas unit heater, and the upfront cost is higher.

Electric heaters are the simplest option but the most expensive to operate in NB. A 240V electric garage heater (4,000 to 7,500 watts) costs $300 to $800 installed but runs on NB Power electricity rates that make sustained heating expensive. Electric heaters work well for garages that are heated only during occasional use — a few hours at a time for weekend projects — but are not economical for maintaining continuous heat through a Moncton winter.

In-floor radiant heating (hydronic tubes in the concrete slab) is the premium option, providing the most comfortable and even heat with no cold spots and no drafts. However, it must be planned and installed before the slab is poured — it cannot be added retroactively. Costs run $8 to $14 per square foot for the in-slab system, plus the cost of a boiler or heat source. Total installed cost for a two-car garage is $8,000 to $15,000. This makes sense for homeowners building a new garage who plan to use it as a serious workshop or hobby space.

Regardless of which heating system you choose, insulation is the prerequisite that makes any of them affordable to operate. Heating an uninsulated garage in Moncton is like pouring money out the door — literally. Insulate walls to R-20 minimum, the ceiling to R-32 or higher, and install an insulated garage door before investing in a heating system. Browse garage contractors through the New Brunswick Construction Network at newbrunswickconstructionnetwork.com to find heating and insulation professionals in the Moncton area.