What are you using to heat your garage?

[lyrikz]

My garage is attached to my house. 2 car garage, barely. Its kinda cold in there. What are you guys using to warm the garage up? I dont need it to be heated at all times. I just need to be able to have it warm for say an hour at a time. I bought an electric heater and it has 5000 btu, but it doesnt seem to do anything.. I mean, it would keep me warm, but it wont warm the garage.

The garage is pretty air tight. Some very minor gaps in the garage door seams. I was going to buy a propane heater, but they all say not to use indoors. I know why you cant, but dont know if it would work for a garage.. SOme of those put out 50000 btus. ahah Thats some warmth...

Anyways... Any good suggestions would help. Thanks.