I would never laught. My fish room is in the garage also. It gets hot here in the summer (So Cal) so I have had a few issues. But I have tried opening the garage in the evening time, letting all the hot air out, then keeping the garage enclosed during the mornings and it keeps the night temperatures in. Then only when it gets too hot, do I open the doors and let the hot air out. Texas has a lot of humid weather too, so depends on where you are at, (which part), a cheap way to go is to use a swamp cooler for the garage if the humidity doesn't get too high.