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Why is My Air Conditioner Blowing Hot Air?

In the warm summer months, our air conditioner systems ensure we stay cool and comfortable.

However, sometimes issues arise, such as the air conditioner blowing hot air.

When this happens, it’s usually one of a number of reasons.

Low Refrigerant

One common cause of an AC system that blows warm air is a refrigerant leak.

This could be the result of any number of culprits including:

  • Leaky valves
  • Rusted tubes
  • Loose fittings and connections

Air conditioners do not use up refrigerant, meaning if your refrigerant is low, your AC has a leak somewhere which needs diagnosis and repair.

Thermostat Setting

Sometimes, a problem with the AC blowing warm air is as simple as the thermostat being set incorrectly.

It’s very easy to do, as well as easy to fix.

Be sure your thermostat is switched to the Auto setting, not the On setting. When in the On position, the fan blows air constantly and is more for air movement than cooling.

Also, check the thermostat’s programming and make sure it’s correct.

Compressor and Condenser Problems

Several possible issues involving these components could result in warm air blowing from the AC. An interruption in the supply of power would cause problems. These include

  • Rodent-chewed wires
  • Switched-off power
  • Tripped circuit breakers

Dirty, clogged coils also pose a problem for the AC unit.

This is one important reason periodic cleaning and maintenance is necessary.

A severely dirty unit with clogged coils can impair the AC unit’s ability to cool.


When your AC blows warm air, it can be frustrating and there are potentially several reasons for this.

Begin with the easiest by checking the thermostat, moved on to cleaning your unit, and if that does not work, call in a professional to diagnose and repair the problem.

If you would like more information, or wish to schedule a service, please contact us at (651) 294-7798.

We cover Blaine, Bloomington, Brooklyn Park, Eagan, Edina, Hastings, Maplewood, Minneapolis, Minnetonka, Roseville, North Saint Paul, Saint Paul, Saint Paul Park, South Saint Paul, Stillwater, West Lakeland, West Saint Paul, White Bear Lake, Woodbury, and many more locations.

Can’t find your town listed? Contact us at (651) 294-7798 to tell us where you live, so we can help you.

Schedule a HVAC repair anywhere in the Minneapolis or St. Paul area today by calling (651) 294-7798 or by requesting an estimate online.


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1220 Cope Avenue East, Maplewood, MN 55109