not be on the thermostat side, so it will just get cool air as the house is cooled. Not as efficient, but very common down there. I don't recall what the fire code is for garages there. In some places there has to be a fire wall in the entire attice over the garage. If that is the case then a mini split would be your option. However, we had a large warehouse in Tucson and kept 2 large swamp coolers made for indoor usage and they would drop the temp down into the 80s