shoprat another means if you could locate one is those old fashion oil fired wall heater but you'll have to have a oil tank out back - and a exhaust stack but my brother has this set up in his garage and its very warm in there during winter - I just use a construction type propane heater in mine / but you got to leave windows open to be safe and when messing with gas make sure its off would even think about elect heat - man my house has heat pump - and put another one out in garage - POWER COMPANY would love me