Derek Cole explains why HVAC systems that cycle on and off frequently waste energy, increase wear, and raise bills. The most common cause is an oversized unit that reaches the thermostat set-point too quickly. He recommends inspecting the unit, checking the home's insulation and windows, examining ducts, and running a load calculation to confirm the right size.
So starting and stopping is not good for the power of that unit. It's also not good for the unit. It's kind of like I've talked about before, miles per gallon with your car. Obviously, it's more efficient for you to hop on the interstate and drive 8 hours than to spend 8 hours in stop-and-go traffic, right? You get better gas mileage out of the long trip. Your unit's the same way. So if it is cutting on and off, chances are the unit is too big for the home and it's satisfying that thermostat very very quickly and turn it right back off. It's getting cold or warm again and then it's coming back on, satisfying, coming right back off. So the challenge with that would be wear and tear on the unit as well as running up your electric bill because it's wasting energy. And when you get into the summertime, you're not dehumidifying the house properly. So you walk into some of these houses and yeah, 75 degrees, but it feels kind of clammy and sticky, that's because it's not dehumidifying properly. So when it's, you know, 30 degrees outside or 90 degrees outside, for that unit to run all day is not uncommon. Okay, it's not gonna hurt anything. It's better for it to run longer than start and stop, start and stop, start and stop. Now, I would have it checked out just to make sure you're not having some kind of problem in the unit itself. But if the unit is okay, then you have to look at where it's at, the home and the duct system as well. We tell our guys all the time, there's 3 aspects to a home. There's the unit itself, there's the envelope, which is the home. Is something causing this to happen? Did I change something? Did I change a window? Did I leave something open? Are you missing insulation? You know, is something causing this to happen? And then you got your duct system under the house as well. So check all those things to make sure it's operating correctly. And if all those check out, then we have— we need to do a load on that house to make sure that unit is sized for that house properly. And if it's too large, then we can fix it.
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