1. Take a look at the thermostat.

Even if you believe your thermostat is set correctly, double-check it, especially if you live in a house where others may have "tuned" the thermostat. It's conceivable that only the fan on your air conditioner is on, blowing heated air around your home.

If your thermostat reads "on," your system's fan is running. This implies that even if the interior unit isn't cooling, the fan will continue to blow air through the ducts and out of the vents. For your air conditioner to chill and dehumidify your interior air as the fan circulates it, set your thermostat to "cool" or "auto."

2. Check to see if the outside unit is powered.

Your air conditioner is high-powered equipment, which means it consumes a lot of electricity to run. If there is a brief power outage, your outside unit's circuit breaker may be tripped. Check your circuit breaker panel for a tripped switch if your air conditioner is spewing heated air.

3. Make sure the air filter is clean.

Disposable air filters, according to most manufacturers, are good for up to 90 days—the important term being "up to." If you run your air conditioner all day for weeks on end, that filter will be filthy long before the 90 days are up. If you have pets, the filter will become even more clogged.

So, how can a filthy air filter cause an air conditioner to blow warm air? When a dust-coated air filter becomes clogged, it prevents airflow from passing through your air conditioning system. This causes a number of issues:

To pump out cool air, the air conditioner has to work extra hard.
There isn't enough hot air blowing over the refrigerant-filled interior coil (also known as the evaporator coil).

Parts of your air conditioner may overheat as a consequence, and moisture on the evaporator coil may freeze. Once the coil has frosted over, it will be unable to properly chill your interior air. A frozen evaporator coil also puts the system's compressor at risk of overheating and failing.

If ice has developed on your evaporator coil, you'll need to replace the filter and wait for the ice to melt. Allow the fan on your HVAC system to run to aid with thawing, but make sure the "cool" setting is turned off. You may use your air conditioner again once the ice has melted, however you should have a professional evaluate the system for any concerns. If the ice reappears after you restart your machine,

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