I wouldnt worry about it to much. Ive had a few instances where my power went out when it was very cold. Just recently we had half a day of no power with 20degree temps outside, everybody was fine event he babies. A few years ago my breaker tripped over night, my guess was it was just after I went to bed, the whole room was very cold when I discovered it and was probably like that for 12+hours. My one ball, at the time, was ice cold I put him on my belly while I watched tv for a few hours and he picked right up.