It’s normal for your air conditioner to run longer on hot days, but if you notice that it runs non-stop regardless of the outside temperature, then you have a problem.
Your AC may be running constantly because of one of these common AC problems:
In this article, we’ll start by sharing the issues you can fix by yourself and then cover when you’ll need to contact a pro.
Live in the Minneapolis-St. Paul area? Need an AC repair? Schedule an appointment today.
Try troubleshooting these 3 issues first. If you can’t fix these, then move on to the next section.
The ON/AUTO setting on a thermostat
What do we mean by the “wrong” setting? Well we mean that your thermostat is set to ON instead of AUTO.
Here’s the difference: When your thermostat is set to ON, it sends the signal to your AC blower to run non-stop. On the other hand, when your thermostat is set to AUTO, it sends the signal to your AC blower to run only as needed.
In most cases (with the exception of cleaning), it’s always best to leave your AC set to AUTO because it uses less energy.
Solution: Check your thermostat and make sure it’s set to AUTO instead of ON.
Clean air filter vs. dirty air filter
If you have a clogged air filter, your AC system will run non-stop.
You see, your AC system needs to “breathe” in air to cool. And since all air passes through your system’s air filter, if that filter is clogged, then air can’t enter in the AC’s system.
So, to compensate, your air conditioner will run longer to bring in more air.
Solution: Check your air filter. If it looks dirty like the one in the image above, then you should change it.
Condenser coils located in the outdoor unit of your AC system
Your outdoor unit works like a heat sponge—it “dumps” out heat collected by the refrigerant in the indoor unit (read: how an air conditioner works).
The outdoor unit releases this heat via condenser coils. (The condenser coils are the little fins that look like this).
If sticks or debris are covering your outdoor unit, then your system can’t dump as much heat. To compensate, your AC will run longer to dump all that warm air outside.
A dirty outdoor (condenser) unit
Solution: Clear any debris from your outdoor unit. Also makes sure that all shrubbery, trees and fences are at least 3 feet away from the outdoor unit.
Note: If you notice that the condenser coils are covered in a thick layer of dust, contact a professional to clean them for you. These coils are delicate, so you’ll want to have a trained professional handle and clean them.
If you think you have one of the following problems, you’ll need to call a professional for help.
Refrigerant is the liquid/gas that absorbs the heat from your home’s warm air. If your AC system is low on refrigerant (because there’s a leak), then your AC will take longer to cool your home.
Signs you have this problem include:
For more information, read our article, “How to Tell if Your Air Conditioner Needs More Refrigerant (Freon).”
Where the evaporator coils is located in an AC system
The evaporator coil is the part of your AC system where the refrigerant absorbs warm air and turns it into cold air.
But if the coils are dirty, then the refrigerant has a harder time absorbing the heat from the warm air, which means your AC will run longer to cool your home.
The evaporator coil is very fragile, so it should only be cleaned by a trained professional.
Signs you have this problem include:
Is your AC over 10 years old? If so, that could explain why your AC is running non-stop.
Like any machine with moving parts, air conditioners wear down over time. As components lose efficiency, they take longer to do their job. So it may be time to replace your AC altogether.
Signs you have this problem include:
For more information about replacing an old AC, read these related articles:
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