our main shop area has 30 foot ceilings so it stays fairly comfy in summer. we don't need heat in the winter after a warm summer like we have now
as far as heat. In my garage at home I have an old NG heater'. you can get a gas ring like they use to boil crawfish in and add a varsol drum if you can get one. it fits the ring real good. cut the openings in the side. It works good enough.