i do use a fan, but rats are still dying. fan is just circulating hot air, not really helpful in lowering ambient temps. i think the fan works on people because the breeze evaporates our sweat, but rats do not sweat so it can't do anything for them. my garage has concrete walls but wide open on front and back. rats are kept in screentop racks, so the set up is well ventilated, it's just so dang hot....

my snake room is separate from the house, so i think i can live with a few escapees. but i'm still hoping that my rat rack remains chew proof.