^^^ they have people for that.I leave my thermostat at 65F (18C), so it never get colder than that, but it can get really warm in summer because I don't have air conditioning. Why not? The cost of central air isn't worth it to me for the 4 to 5 weeks of hot summer weather. I use fans in doors and at night to try to cool down the house (or, as I refer to it, my sweat box). Window ACs are too heavy and bulky for me to manipulate.