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Why Is My AC Running but Not Cooling?

Air conditioning for modern house

You rely on your air conditioner to keep you cool and comfortable indoors when it is hot outside. Yet, your air conditioner may not always perform as expected and cool your house correctly. So, when your AC is running but not cooling properly, there are several things you can check before calling an air conditioner repair technician.

Dirty Air Filters

Cooling systems require proper airflow to function correctly. Suppose your air filter is dirty with dust, dirt, pet hair, and other such things. Then the airflow through the system is restricted and will not cool correctly. Therefore, check your air filter and change it if it is dirty. Next, wait about thirty minutes to an hour to see if your AC starts cooling properly.

Outdoor Unit Is Clogged Up with Dirt

There are air vents on your outdoor unit that helps remove heat from cooling coils as the system cycles. When these are clogged with dust, dirt, leaves, and other debris, it can be the cause for your AC not blowing cold air. To have the outdoor unit cleaned, call your AC technician.

Thermostat Issues

Another thing you can check is your thermostat to see that it is set correctly. If it got turned up, the AC could be working correctly, just not cooling your house to your desired temperature. In addition, verify the thermostat is getting power by checking your breakers.

If a breaker tripped, that could be the cause of the problem. Reset the breaker to get your AC going again. However, if it trips again, call your AC technician, as something is overloading the system.

Air Duct Leaks

If you have leaks in your air ducts, they will suck warm air into the house whenever the AC is running. A common sign that your air ducts leak is when your home gets extremely dusty very quickly. You can schedule air duct cleaning and leak sealing with your AC technician.

Frozen Evaporator Coil

If you set your thermostat too low or your air filter is dirty and clogged, it can cause the coolant in the system to freeze. When it does, it will not cool correctly. You will have to shut off the system and wait for it to thaw out. If the problem keeps recurring and your air filter is clean, it is time to call for AC service.

The AC Wasn’t Sized Correctly

AC systems that are too small or too big for your home will not adequately keep your house cool. Undersized systems run almost constantly on hot days because they simply cannot keep up with cooling. Oversized systems tend to short cycle where they turn on, run for a few minutes, and shut off. Have your AC tech verify your system is sized correctly. If not, you should replace it.

There Is a Coolant Leak

Electrician repairing air conditioner indoors

While coolant leaks are not as common on modern AC units, they can still occur. Once the coolant leaks out, there will be insufficient coolant left in the system to cool the air when the system runs. If you suspect a leak, shut down the system and call your AC technician for service.

The AC Is Old

As air conditioners age, they gradually start losing their cooling efficiency. So, if your AC is more than ten years old, it just may be time to get a new energy-efficient unit for your house.

Air Conditioner Repair, Maintenance, and Replacement Services

When your AC is not blowing cold air, you can rely on Christianson Air Conditioning & Plumbing for AC repair, maintenance, and replacement services in Austin and San Antonio. We will diagnose your system to determine the problem and provide you with potential solutions to get your house cooling correctly. Contact us at 512-246-5400 to schedule service today.

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