My house has forced air heat/cooling...in winter my thermostat is set to 70* & in summer it's set to 80*. (I'm not keeping BPs, btw...mostly colubrids that
need less heat.) I'm pretty far South & summers are hot, so most of my UTH is turned off during that time, depending on the snake. (I have a spotted python
that requires more heat, & a few desert snakes...so all cages are adjusted individually.)
I agree w/ Deborah's & bcr229's suggestions...note that the one issue with using frozen water bottles to cool a cage is that they drip condensation. Cool air sinks,
so might want them on top of cages? It's awkward but it's an option, anyway.