You can take a 20-oz empty plastic pop bottle and fill it with water 3/4 full put the cap on it freeze it then put it into a tube sock, tie the end of it in a knot them put the water bottles in the ferret cage and it will keep the temp in the cage cooler, also you can wet towels and ring them out almost dry and cover the cage with the towel/s. I keep frozen pop bottles in the freezer in case the power goes out or I have to travel in the car w the ferrets Ada [Posted in FML 7506]