Shop/garage heating & cooling: what'd you go with?

[Charley Lillard]

My car barn is 50'x100'. I started out just wanting heat to keep moisture away in the winter. The cost of radiant heat was too high so I decided to do a gas furnace. Alot of the cost is in the ducting etc so for a little bit more I just went with a combo heat/ac unit. I put in a 5 ton unit. In the summer it would run the ac all day and still not cool it so I added a second 5 ton unit. I have the building sealed up pretty tight with a outside air intake that filters the outside air. The fan is always on low and pulling just enough outside air in to pressurize the building to keep the dirt out.