My husband says we use more energy to heat the house back up after being that cool than we use to keep the thermostat at 72 or 73 degrees all the time. The temp is turned up for less than 5 hours a day, if we only raise it when we're home in the evening.
I believe that's true for air conditioning, but I don't think it's true for heating. We have hot water baseboard heaters, if it makes any difference, and do not have central air.
1. Which is better - leaving the house at the same temperature all the time in the winter, or turning down the heat when the house is not occupied and raising it only when we're at home?
2. Our only air conditioning is a window unit, and our rental is a two-story house. We put it in our master bedroom (first room at the top of the stairs) and leave it on all the time. Would we saev energy/money if we turn that down while we're out? Is it really best to just let it run all the time? I don't know the BTUs or any of the details on it, except that is is a small-ish unit and does well for one room but probably wouldn't cool off the whole floor.
Thanks in advance for your help!