Why is AC Blowing Hot Air?

10 Steps to Solving Air Conditioning Problems

• You may be frustrated if your air conditioner blows out hot air, especially during the summer. This guide can help you identify the issue and fix it if necessary.

Check the Thermostat Settings

• • Thermostat Mode: Ensure your thermostat is set to "cool" and not "heat" or "fan."
  • Temperature Setting: Ensure the temperature is lower than the current room temperature.
  • Battery Check: If your thermostat has batteries, they might need replacing. Low batteries can cause the thermostat to malfunction.

Inspect the Air Filter

• • Clogged Filter: A dirty or clogged air filter can restrict airflow, causing the system to overheat and blow hot air.
  • Solution: Check the air filter and replace it if it's dirty. It's recommended to change the filter every 1-3 months.

Check the Circuit Breaker

• • Tripped Breaker: The air conditioning unit may have a separate breaker that could trip, especially during power surges or overloads.
  • Solution: Locate the breaker panel and ensure the AC breaker is in the "on" position. If it's tripped, reset it. If it trips again, consult a professional.

Inspect the Outdoor Unit

• • Power Supply: Check that the unit outside is getting power. Sometimes, the switch near the outdoor unit or disconnect box could be turned off.
  • Debris and Obstructions: Check for any debris, dirt, or obstructions around the outdoor unit that could restrict airflow or cause overheating.
  • Condenser Coils: Dirty condenser coils can reduce cooling efficiency. Cleaning them can resolve the issue.

Check the Refrigerant Levels

• • Refrigerant Leak: Low refrigerant levels due to a leak can cause the system to blow warm air.
  • Solution: Contact an HVAC technician if you suspect that there is a leak of refrigerant. Only certified professionals should adjust the refrigerant level.

Examine the Ductwork

• • Leaky Ducts: Leaks or holes in the ductwork can let warm air into the system, leading to hot air blowing from your vents.
  • Solution: Inspect ducts and look for visible damage. A temporary fix is to seal any leaks. Duct tape will do the trick, but hiring a professional is best.

Compressor Issues

• • Faulty Compressor: The compressor is responsible for circulating refrigerant through the system. If it's not working correctly, the AC won't cool properly.
  • Solution: If the compressor is faulty, it usually requires a professional to repair or replace it.

Check for Frozen Evaporator Coils

• • Frozen Coils: If the evaporator coils freeze, it can block the airflow, causing warm air to blow out.
  • Solution: Turn off the AC to allow the coils to thaw. Check for and fix any underlying issues like dirty filters or low refrigerant levels.

Inspect the Capacitor

• • Faulty Capacitor: The capacitor helps start the compressor. If incorrect, the compressor might not run, causing the AC to blow warm air.
  • Solution: A professional should replace a faulty capacitor.

Professional Maintenance

• • Regular Check-ups: Schedule regular maintenance with a professional HVAC technician. They can check all the components, recharge refrigerant, clean coils, and ensure everything functions properly.

Pay Special Attention

• This guide should help you troubleshoot and address the common causes of an air conditioner blowing hot air.

• If your air conditioner is still blowing hot air after going through these steps, it’s time to call a professional. Sometimes, the problem can be complex and require specialized tools and knowledge.