[Draw4u]

I have a 3 car garage as well and I have 8 porcelains in the ceiling and each one of them have a 300 watt bulb in them. It puts off lots of light. As far as the heat and A/C, you will probably have to use a 2 to 2-1/2 ton unit at least. For a garage, I would figure 1 cfm per sq. foot and there are 400 cfm in a ton, therefore probably needing 2-1/2 tons. It will also depend on the ceiling heights.