I have had good luck so far with piping A/C in down low and using an air cooled light fixture to exhaust the heat up high. It gets 100 + deg in my garage and have been able to keep my temps in the enclosure to around 65deg with lights off to about 75 with them on. I just use a 12,00btu window A/C and a 440cfm fan pulling through my light and ducted out of room. Hope this helps. :rasta: