AC setback - rule of thumb?
Does anyone know of the most efficient setback temp for the AC in summer? I live in eastern PA and have kept my AC at 78 during the day and 74 in the evening, but I notice it runs a lot in the evening stay to stay at 74 after being set back.
This week, I held the temp at 74 all day and the AC seems to run a lot less and still hold 74. I'm wondering if just holding the steady temp is more efficient.
Overall, my electricity costs are low as the house is sealed well and I'm running a 2 year old Bryant Evolution. Does anyone have any thoughts? Thanks.