I've seen minor problems with heat at 86 F. I think high temps are more damaging than low temps though. I have had heaters stop working and temps below 74 F without much trouble.
I do 80 F Summer, 82 F winter
I try to make sure it doesn't get out of the 78-84 range.
In Missouri it's not uncommon for the outside temp to change 60 degrees in a few hours....it makes things tricky sometimes.
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