you might be surprised how hot it is *not* in the garage. as i said...three doors all in full sun on a 100F day is only about 100 in the garage. doors are thin steel, little window that has UV filter on them. it surprised me. i now keep the doors open about a foot and the side door open all they way. it helps, but not much. i actually think more heat is from the hot engines once parked inside. they get to about 200F and all that heat has to go somewhere.