I have 3.5t westing house unit outside of the house,6 monhs old and Payne 3T unit on the atic 7 years old.
The temperature in the house is 82 and outside in the shade 92. Inslutaion is pretty OK.
I am thinking about replacing atic unit. Is needed to replace whole unit or only parts for cooling.
I do not know anything about A/C.