Why is my AC blowing hot air?

Why Your AC is Blowing Hot Air

When your A/C is blowing hot air into your Indianapolis home, you want to find the cause so the situation can be resolved quickly. Read on to learn the common problems that cause the A/C to blow hot air and see if you can troubleshoot the issue or if it’s time to contact an HVAC professional.

Thermostat Setting

The simplest fix, which you’ve probably already checked, is the thermostat. Check one more time to make sure the thermostat is on the “cool” mode and adjusted well below room temperature. Also, check the wiring in the thermostat to ensure the wires are securely fastened to the terminals.

Condenser Coil

The condenser coil is located in the outdoor unit of a split-system A/C. If the condenser is too dirty, heat exchange is blocked. Shut off power to the unit at the disconnect plug, and then spray the sides of the unit with a foaming coil cleaner, followed by a garden hose. Continue to spray the entire unit until it’s clean.

Evaporator Coil

The evaporator coil is generally located on top of the furnace in an upflow system. You may need to remove a few panels to access the evaporator. If there is ice accumulation on the evaporator, turn the A/C to “fan” mode or turn on the furnace to help melt the ice. Before doing so, check the air filter and change it if it’s dirty. Poor airflow across the evaporator creates ice buildup. Also, use the foaming coil cleaner on the evaporator. If ice returns, call your technician.

There are other causes for ice buildup, such as an electrical problem or incorrect refrigerant charge. Your HVAC tech needs to handle those issues.

Compressor Problems

When you cleaned the condenser coil, you also cleaned the compressor, which helps prevent overheating. However, if you hear humming, grinding or rattling from the outdoor unit, turn off the A/C and call your technician.

To learn more about why your A/C is blowing hot air into your Indianapolis home, contact Airtron Heating & Air Conditioning.

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