....72 in winter and 75 in summer.....my logic is if I can't be comfortable in my own home where then......and those numbers are my comfort level....no heating pads or extra heaters in winter or extra a/c units in summer....electricity is more expensive than natural gas. Many yrs ago my DH owned a barber shop ans was told to keep the thermostat at the same number even when not in shop, because if lowered or raised then adjusted when occupied, more energy is used to bring that temp to desired number, thus not really cost effective.....