"Phisherman" wrote in message
news
You could burn unwanted wood. There are small iron stoves that don't
take up much room and put out quite a bit of heat. I have seen one
auto-mechanic garage burner made from an oil drum that vented to the
outside and it worked well. The downside is that you don't have
instant ON/OFF like with electric. With the proper setup it can be
safe.

But since he has a car in there, it would be a violation of fire codes to
have a solid fueled heater in an attached garage. It is a danger in an
unattached garage, but I'm not sure of the code. Those embers stay hot
enough to ignite gas for many hours after you stop feeding it and it sucks
combustion air from the garage.