HarvSlugger yo Harv, depends on a lot of things it think, age and life experience included.. My north and west facing kitchen, with its tiles is a coolish (right now) 22C, ditto all east facing rooms that have had their curtains closed all day. I cannot sensibly sleep or function if the bedroom temperature is anything higher than that, and even as it is , its a sheet only affair, even the cat is too hot to sleep in the house. I was brought up and lived in East, West and Central Africa as a child/adult, and depending on the humidity, or lack of, depended on whether you had the air con on and could actually sleep. So Ethiopia and Uganda dry air, little humidity, no air con, unlike Nigeria, where you couldn't function really without it, as the humidity levels were through the roof. Back in UK, in 70’s and 80’s with single glaze windows, drafts, sparsely heated houses you learned to wear the wardrobe in winter and love the coolness in summer, which is why our house in the Ceiriog Valley ticks all the boxes in terms if that, but zero boxes in terms of double glazing/internal thermal insulation, air source heat pump stuff. Guess its all age related.