I keep my little guys at 78 F, but you could go from about 76 to 80 safely. The Dwarfs seem to have a high metabolism and I find that the standard "once a day as much as they can eat in 3 mins" isn't enough for them. I feed small portions 2 times a day (I think it's better than lots once a day...less waste) and my little pack is always chubby