Garage Heater Recommendations

[Dead Parrot]

Insulate first, then worry about a heater. And not just the doors. A lot of garages, even fully attached ones, were often built with little to no insulation.

Unless Canadian standards are way different the US standards, a 120V electric heater won't make much of a difference. Most are limited to a max of 5000BTU. By comparison, I have a 17,000 BTU electric in my shop(240V). My shop is about two cars wide and fairly well insulated. Plus the single car door is also insulated. It takes that heater a couple of hours to get the shop to heavy coat not needed levels when the outside temps are 20~30F outside.

Probably best to leave painting until warm season. Indoor painting needs a lot of fresh air to keep you safe and that brings a lot of cold air into your warm shop. Even a small rattle can paint session for 3D printed things can leave my shop smelling bad for a long time unless the door is open. I normally wait until the outside temps are above the minimum temp on the paint can then open the doors before painting.