Usually they are OK for a while at room temperature and will just slow down or nap. If the outage isn't long it shouldn't be a big problem. You can also hold them to share body heat or you could use a hand warmer wrapped in a towel to provide some extra heat. As long as your house doesn't get unusually cold I wouldn't worry about it too much.
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!