I have two AC units. One downstairs and one upstairs. No one lives upstairs at my house. I need advice on what temperature to program upstairs to help save on my electricity bill. Any advice to share?
Our home is like this too. I've found that if we keep the upstairs door open and the air rushes up the stairwell, it makes our downstairs furnace work twice as hard--it isn't the proper size to heat/cool such a large area. If you are not using the upstairs, turn off the AC and seal the door. But in winter, use the furnace if you have an upstairs bath and it freezes outside, so your pipes won't burst--unless there is a way to drain them.
I would leave the door open, let the heat go upstairs and use the upstairs AC the most, turn down or seldom use the downstairs AC and that way you will have the best cooling downstairs for the cheapest cost. I lived in a house like that, it was easy to cool this way.
We just bought a two story house that we are restoring. We have closed off the upstairs (luckily a door actually closes off the stairs), I would recommend that if no one used the upstairs, why cool it off if you don't have too.
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