Most guidance is a few ticks cooler and night time 35-40 with days 55-60 will likely warrant it. Sun is worth crap these days.....doesn’t even heat the upstairs much like high summer. If we get an overcast house stays cold. Anyway, when you flip on the heat you acknowledge there’s not further need for a/c. We haven’t had it on in weeks. All about sun angle. Long range doesn’t look terribly warm tbh.