Reason #3: Faulty Thermostat or Wrong Setting. A faulty thermostat setting actually happens pretty frequently. Sometimes buttons get bumped or switches get moved accidentally and your system could actually be set to “heat” or the fan could be set to “on”. If the fan is running continuously, the air may feel warm when the air conditioner.. 1. Dirty Air Filter. The air filter is an essential part of your AC unit. Therefore, if your AC is blowing warm air, it might be because your air filter is dirty. When dust and other air pollutants are stashed on your unit’s air filter, they reduce the airflow. As a result, the hot air will flow out through the grates and ducts.
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Make sure “A/C” is selected, then choose a temperature that’s lower than the ambient temperature outside. If “A/C” is definitely selected and the temperature is set to low, but your fans still blow warm air, your thermostat might be broken. Have a mechanic check your thermostat and repair it. 3.. Restricted airflow. This is one of the most common issues that people run into when their system is not blowing out cold air. One of the leading causes of airflow being restricted is having a dirty filter. If this is the case, simply change out the filter. If you are not sure how to change your filter, check this article out.