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Get your outside coil cleaned.
If the system is big enough for the house, there should be no reason it can’t maintain under 80 degrees unless something is wrong with it.
Check the filter in the house and check the outside coil for dirt and debris.
Appreciate the advice. I change the filter every month on the 21st and clean the coil each March. We have really drafty early 70s windows.
Might get my refrigerant checked.