garage heating

Get electric baseboard heaters installed. Not only will it allow you to have a heated garage that you can set temp at what you want and keep it there at a reasonable cost, it also helps keep it dry and if you have any gas fumes or paint fumes you don't have to worry about it exploding. A wood stove in a garage is ok, so long as there are no sources of gasoline vapor and definatly DO NOT PAINT, spray or otherwise, around a wood stove, one small back draft and they will be cleaning pieces of you and your garage up from the surrounding counties.

I have electric baseboard heat in my garage and a ceiling fan to help circulate the heat around the garage evenly, also helps keep the floor at the same temp. It's so dry out there I can have a piece of bare steel out there for ten years without surface rust forming on it (I know this because I had a car that I had done some sanding on, down to bare steel, that sat out there for ten years that way, no surface rust.) I also do not open or close the main door very often, especially in the winter. It's my shop, not a garage, LOL :shaking2:

Propane heaters also put out corrosive by products along with the carbon monoxide problem. Bad deal for both you and the cars.