I just moved into the duplex I am house hacking. I put in a couple 7 day programmable thermostats to take a step toward a more efficient house; each unit only has one thermostat. My question is, which would be more energy efficient: setting the thermostat at 65 and just leaving it, or actually programming it to drop the temperature when I leave and warm it up when I come back? I'm just wondering if it would actually take more energy to bring the place back up to temp than it would to just let it maintain one constant temperature. In case it helps, it is a gas/hot water system.
I have heard that programmable thermostats save money on heating. However, if you have air conditioning it is best to keep the temp constant because cooling back down takes more energy than leaving the thermostat set one temperature.
Use the factory settings. And it saves money heat or cool, thats why they are so popular.
Yeah this would just be for heating. I hope you're right!
Outside air temps have a lot to do with it, extreme differences will cost you more.
In our own experimentation it hasn't made hardly any difference in costs, we keep ours within a couple of degrees.
I've been hearing stories this winter about heating systems not able to climb back up after being setback for the day. IMO the interfaces on these things suck, they're confusing as hell as you have to cycle through 4 periods per day plus weekends. I think there's a market for something less than a Nest that you program by Bluetooth from your phone.
If you are not changing more than 3 or 4 degrees it wont make a different. You can also use the circulate feature that will help notice the temp difference. Set it what you want as you wont see a big difference is cost (<5%) to run the unit.
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