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Heating & Air Conditioning Experts with over 80 years combined experience

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Furnace and AC Installation

Office Location:
305 West South 1st Street
Johnstown, CO 80534

Call Today 720 884 7646

Why is my Air Conditioner Blowing Hot Air

air conditioner blowing hot air

At Ideal Comfort HVAC we serve Johnstown, Boulder, Longmont and North Metro Denver. One AC complaint we hear often is “why is my air conditioner blowing hot air.” We have three good reasons why your air conditioner is blowing hot air!

Noticing your air conditioner blowing hot air? Now that’s a reason to sweat.

Don’t panic. There are many different reasons why your AC is blowing warm air and sure, it can get kind of complicated.

Before you call – check out Ideal Comfort HVAC’s tips on why your air conditioner may be blowing hot air!

Thermostat set to HEAT or fan set to ON

Yes, we’re serious. Check your thermostat setting and make sure it’s NOT set to “HEAT”. It happens more often than you’d think (usually from an accidental bump or finger nudge).

“ON” means the fan is always blowing air through your vents, even when your system isn’t working to cool the air it blows. And, while that can help improve air quality if you have a whole-home air cleaner installed, it could also be the reason why you feel warm air (or at least air that isn’t cooled) blowing through your vents.

DIY fix: Make sure your thermostat is set to “COOL”. And use the “AUTO” setting if you don’t have a whole-home air cleaner.

Outside unit clogged

air conditioner blowing hot air

Your home’s AC system is made up of 2 main components— an outside unit and an inside unit. Both units work together to remove heat from your home. To do that, it needs unrestricted airflow to something called a “condenser coil”, which is located in your outside unit.

An outside unit clogged by dirt, leaves or debris can keep your AC from properly cooling your home’s air.

DIY fix: You can prevent this problem by using a broom to sweep any visible debris away from your outside unit. Also make sure to trim bushes, weeds and tall grass that could restrict airflow.

Loss of power to outside unit

As we discussed earlier, your AC system is actually 2 parts that work together. If the outside unit loses power but the inside unit doesn’t, it is possible that you could experience warm air coming out of your air vents.

There are 2 places an outside AC unit can lose power:

  • At the circuit breaker. Check to see if the breaker for your outside unit got tripped.
  • An emergency shutoff switch. This is usually located on your home’s exterior wall, right by the outside AC unit. Check to see it’s in the “on” position.

DIY fix: Locate the breaker switch on your outside unit and flip the switch all the way OFF and then back ON.

Note: If your AC continues to trip your breaker, call a professional! This is a sign of a serious electrical problem in your air conditioner.

Problems that need an AC professional

Here are a few more complicated causes that your AC is blowing warm air that will also require a professional’s help.

  • Low freon/refrigerant Leak
  • Dirty evaporator coil
  • Return duct that is broken or disconnected

Need a professional air conditioning company in Boulder, Colorado and Longmont, Westminster and the North Denver Metro Area, Schedule today! 

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