this post was submitted on 19 Mar 2025
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No Stupid Questions

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Where I’m at, the temps flip-flop day to day, even hour to hour. In the morning it’s 35° outside, and by evening it’s 79°. I gave up keeping up with the temps and shut my unit off for the time being.

My question is why can’t HVAC units be programmed to say that if the outside temp reaches n° and the inside temp reaches m° cold, turn on the heat; conversely, if the outside temp rises to n° and the inside temp reaches m°, then turn on the AC?

My thermostat already knows the outside and inside temp, but I still have to manually switch it back and forth. I want a system that I can just set it and forget it all year round.

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[–] FuglyDuck 10 points 1 day ago (1 children)

thermostats don't run off what the temperature is outside.

usually, they have set points- heat comes on if the temperature goes below x, cooling/air conditioning comes on if it goes above y.

Does your system have a physical outside sensor for temperature? or is it pulling that information off the internet? your immediate location and how you're situated on your property (plus things like how well your home is insulated, the color, how many windows you have... etc,) has more to do with how hot it gets inside. Or, for example, if you get a lot of sunlight coming in, it can heat up the house with it being horribly cold outside.

Regardless, if it's not staying comfortable, look for a "heat and cool" option and then adjust the set points to within a more comfortable range. keep in mind that will cause energy costs to go up as it's now actively heating or cooling more. (This time of year plays merry hell with HVAC systems,)

[–] [email protected] 4 points 1 day ago

Tbf, they are just annoyed they have to do something with the HVAC, like press a button or a switch.

Wait until they find out you have to change a filter