Your Garage Heating System

Looking to put heat in my detached two car garage and looking for ideas (Do not really want to take up floor space if possible).

Please post picture of your heating system and how it is vented/exhausted to the out side.

Thank You!

KP

I use 2 of these. 45,000 btu each...natural gas...pipe is thru
the roof. Brand is Hot Dawg