[asianthree]

Since 2010 we have kept the air at 80 in the summer. 2019 and 2020, left the air temp, at 77. We have a stucco designer, 2000sf.

Compared each month from 2010 to 2020. Cost at 80 for 9 years, was about $13 dollars less than the last 2 years at 77. What I did notice at higher temps, was anything made of plastic became brittle. Combs, sunglasses, and so on broke when used. 2019 and 2020 I didn’t have to replace anything.

This year we had to get a new system.
Installer said keeping at 77/78 keeps air running a small amount more than at a higher temp of 80, since the house is closed up. So if seco stays about $13 more, a month, keeping house cooler I am good with it, and I won’t have to replace so many sunglasses.