Why is My AC Blowing Warm Air?

When you run your air conditioner, you expect it to cool your home and do it fast. Whether it’s years of wear or tear on an older system or the occasional new system glitch – warm air is not what you expect from your AC unit. Below are the most common reasons your system may be blowing warm instead of cold air.

Dirty evaporator coils and air filters: The evaporator coils need to stay clean with the help of an air filter. When these coils get dusty or covered in dirt, they won’t function as they should.

Dirty outdoor air condenser: The outdoor part of your AC unit needs a free flow of air in order to cool your home. Dirt, mud, and other debris can clog up the airways and lead to warm air coming from your vents.

Thermostat issues: Your thermostat is the only way to tell your AC what to do. If the electrical signals aren’t hitting the AC unit, you can’t cool your home.

Low refrigerant level: Every AC unit has coolant liquid that flows through pipes to cool the air. If this liquid leaks out or dries up, your AC unit can only push through the air it received from outside.

Electrical panel issues: Your AC unit takes a lot of electricity to operate. When there isn’t enough power for it, or your system blows a fuse, the unit just won’t run.

These are just a few of the problems that can cause your AC unit to blow warm air. Most of these issues need to be diagnosed and solved by a professional but there are a few things you can look at that might help to see if you have a simple fix on your hands.

Replace your air filter: Air filters are essential to helping your AC run well. If you haven’t replaced your air filter in a few months, it may be time for a new one.

Check your outdoor unit: If your outdoor unit is caked in mud or dirt, carefully brush it away. This allows for better airflow into the unit and into your home.

Listen for odd noises: Your AC has many moving parts, and if you listen closely, you may hear a fan or motor that’s failing. 

It’s always best to work with an expert technician to get your AC working like new.