I don't know, that's what I'm trying to find out actually.. It can get pretty darned hot out there in the middle of summer.
Keeping a freezer inside the house is not really an option. My house is very small and we're already strapped for space. I currently keep 5-10 small mice in a one of these things inside the house.
They are no big deal. Easy to care for. I keep them fed and make sure they have access to water 24/7, and clean their "cage" once a week. But more than 10 small mice and it gets outta hand.
hrm..... maybe I just need to get a second mouse "cage".... I'm probably over thinking this a little bit...