77 - 82F surface temp & 85 - 86F air temp during day
73 - 75F surface temp & 77 - 79F air temp at night
Room temp is mostly 68F during winter here, so the overall cage temps are maybe 3 - 4F higher when it's not freezing outside. Our windows are made with single-glazed glass so the cold gets inside more easily. I minimalize handling now to only when needed, I wouldn't be surprised if my retic caught his little illness during handling times, although handling is mostly around 5 to 10 minutes max. But that's maybe enough to trigger it.