I'll come up with something... whether that be to decrease the temp in the garage or put them somewhere else.
Either way, I'm definitely keeping the little guys in the warm garage. Hmmmm... I just remembered that there is a large closet in the garage under the steps. It's very likely that it stays colder in that closet than in the main part of the garage. If you open a closet in the winter that is on an outside wall, it is always colder than room temp. That may be my solution.
Does total darkness matter?