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Why Is My AC Blowing Out Warm Air?

Your central air conditioner is running, but the house just isn’t cooling down. In fact, the air coming from your vents feels warm! Now what? There could be one of many reasons why this is happening, but the good news is that you may be able to fix the problem by following just a few troubleshooting steps. 

Below are five of the most common reasons why air conditioners blow out warm or room temperature and some tips for what you can do about it.

1. The thermostat is set incorrectly or needs some new batteries.

Make sure your thermostat is set to “on,” rather than “auto.” When your thermostat is set to “auto,” the fan in your system will keep running whether or not the equipment is cooling the air running through it. When it’s set to “on,” your system will be actively cooling air while the fan runs. If your thermostat won’t respond or doesn’t show any of your changed settings, it most likely needs some new batteries.

2. The air filter is clogged.

Manufacturers recommend replacing your air filter at least once every 90 days. However, if you own pets or have been using your air conditioner more frequently lately, your air filter may have gotten dirtier faster than expected.

When the filter gets clogged with dust, it prevents an adequate amount of air from flowing through your air conditioning system, which can cause cooling issues and mechanical problems. Try changing your air filter (or cleaning it, if yours is reusable), and see if that solves the issue.

3. The condenser is too dirty or crowded.

The condenser is your central air conditioner’s outdoor unit. Because it’s outside, shrubs and bushes can crowd it, and dust can cover its metal coils, inhibiting their ability to release heat. If this appears to be the case with your condenser, shut your AC system off and clear away the vegetation around the unit. Next, gently clean the condenser with your hose or a sponge to get some of the dirt off. Just be sure not to blast the unit with high-powered jets of water, as you’ll risk bending the fins or damaging the components.

4. There’s a problem with the evaporator coil.

The evaporator coil sits inside of your home and contains refrigerant. As your AC system blows warm air from your home over the coils, the refrigerant in the coils absorbs heat from the air, thereby making the air cooler. If the evaporator coil goes too long without maintenance, it can become caked with dust and unable to absorb heat as effectively. Before something breaks from overworking or overheating, it’s a good idea to get your AC system professionally maintained.

5. Your AC has a refrigerant leak.

Even a little refrigerant leak can throw off pressure and temperature balances in your AC system. If the evaporator coil has iced over or if you hear a bubbling or hissing sound coming from your indoor unit whenever your AC turns on, then refrigerant is probably leaking. Refrigerant issues should only be fixed by trained professionals. Refrigerant is toxic to humans and harmful to the environment if mishandled.

Is your AC struggling to cool your home?

At JSP Home Services, we are known throughout Kingston and the surrounding area for our professionalism, A rating on BBB, and reliable AC repairs. To schedule your AC service, contact us now at (845) 209-1700 .


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