Need to heat a 2 stall garage.
 

I uased to heat my small garage with a couple of those small parabolic
heaters that run off of disposable propane tanks.
You can refill the tanks with a simple adapter from Harbor freight and
they put out a surprising amount of focused heat.
Keeps yer toes warm and I never sufered any ill effects.
This in California mind you so it only got down to about 40f