Yes, I started using mine a few days ago, and we have had frost on a couple of nights. Mint is free range in the playhouse at night, with his double hutch permanently open so he can come and go as he pleases. I have been putting the heat pad in his sleeping area upstairs in the hutch, under the hay. I don't know if he is using it or not to be honest......as I put it in there last thing late at night and then shut up the playhouse door for the night. I will spy on him one night and see if he uses it, I bet he doesn't as when I go down in the morning he is not in his bed compartment.