How to Handle an Air Conditioner That's Blowing Hot Air

How to Handle an Air Conditioner That's Blowing Hot Air

If your air conditioner is blowing hot air, it doesn’t necessarily point to a major system malfunction. The problem could be linked to dirty components, a clogged air filter or improper thermostat settings. Read on to see if you can resolve the issue with these tips before calling your HVAC technician.

Check For Evaporator Ice

Ice buildup on the evaporator coil is a common problem, with many potential causes, that essentially stops the cooling process. The evaporator needs free airflow to extract heat from the home. Ice buildup blocks heat exchange. Perform the following steps if there is ice buildup on the evaporator:

  • Turn off the A/C.
  • If the air filter is dirty, change or clean it by manufacturer specifications.
  • Run the A/C in “fan” mode to expedite ice melt.
  • When the ice has melted, check the evaporator to make sure it’s clean. If it’s dirty, use a foaming coil cleaner to clean it.
  • Turn the A/C on as normal. If the ice returns, there is a different problem which requires the expertise of your HVAC tech.

Dirty Condenser

A dirty condenser coil can restrict home cooling as well. Use a garden hose to spray the sides of the outdoor cabinet of the A/C system to remove dirt and grime. You may also try a foaming coil cleaner for cleaning purposes, followed by spraying with the garden hose.

Pressing Compressor Issues

The compressor is located in the outdoor cabinet with the condenser. When you’re cleaning the condenser, this should also help clean the compressor. A dirty compressor can overheat and stop working. If the compressor is making unusual noises, such as humming or rattling, call your HVAC tech.

Thermostat Mode

Check the thermostat one more time. The thermostat should be set to the “auto” or “cool” mode. If you’ve recently installed a new thermostat, check the wiring schematic again to ensure correct and secure terminal connections.

If your A/C is blowing hot air into your Portland area home after trying these troubleshooting tips, please contact Roth Heating & Cooling today for more information or to schedule an A/C tune-up.

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