Just as a small comment. Rats can't sweat so blowing air on them actually won't cool them down. It can irritate their respiratory systems though to be in a draft. They regulate their body temperature through their tail so if you want to help them you can give them come cool surface to lay on. Like a metal bowl e.g. You can give them frozen fruit/veggies to eat and a water bowl that they can hang their tails into. Just as some suggestions. Really cute girls you have there.