I had one who acted like he was boiling at 68 deg which was a pain since he liked it at 60, and I have one now who is cold at 68, the others don't care .
Cold on this chin because he has thin fur means he snuggles in his fleece blankets. He has one mattress on the bottom of his hidey houses and a blanket on top, when cold he wraps the blanket around himself, when warm he throws it out of the house.