I know they deal with cold much better than with heat, over 80* F is too hot for them. I've seen scientific studies done that showed that around 60*F is best - they tested baby rabbits to see at what temperature they grew and survived best in.
Some sites say they are most comfortable between 55*F - 75*F, if you want numbers. They can tolerate colder temperatures better than hotter.
I haven't turned my heat on at all yet this fall, and our house has gotten pretty cold at times. The rabbits are fine. When it's time to turn the heat on I usually keep it around 60*, never hotter than 70*. That's more of a personal preference, but I've had house rabbits for over 4 years now and they always seem to do fine inside in the winter.
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