I am no expert but I would think 76 - 78 would be fine. I used to buy rats from a lady that raised them in a cellar that wasn't attached to her house. It got really hot in there in the summer and she used big fans to help cool them. I think this type of situation is what the care sheet was referring to about keeping them cool. My daughters have a hamster and it is about 76 on average in the room and he doesn't drink excessively.

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