[PNJSNAK]

Wall mounted gas radiant heater is the way to go. Mr. Heater, easy to install and hook up.
Keeps everything in the garage at the same temp. No more condensation and if you have a daily driver, it’s nice to get in a car that is 45-50 when it is below freezing outside.
And like said above, when you want to work on your cars in the dead of winter, crank it up to 70 and wear light clothing while you work.