Reasons Your Air Conditioner is Blowing Hot Air When Set to Cool

Reasons Your Air Conditioner is Blowing Hot Air When Set to CoolWhen your air conditioner is running, warm air coming from your HVAC vents is a cause for concern. There are various reasons why this might happen: it may be a mix-up in your HVAC settings, a maintenance issue, or a serious problem within the cooling system. Here are some of the most common causes and what to do to restore the flow of comfortably-cool air.

Incorrect Thermostat Settings

There are a couple of thermostat setting mistakes that can halt your A/Cs cool air output, but they’re easy to fix.

  • The thermostat accidentally got switched to “heat” mode and simply needs resetting to “cool.”
  • The fan is set to “on,” so it runs continuously and pushes out warm air in between air conditioning cycles. To have the fan run in tandem with the A/C so only cooled air gets distributed through the ducts, switch it “auto” instead.

Non-Functional Outdoor Unit

If the airflow coming from your registers turned warm suddenly, the issue may be a loss of power at the air conditioner’s outdoor unit. To get the unit going again, you may just need to reset a tripped switch or breaker, so check the emergency shutoff switch located near the unit, and the breaker in your main electrical panel. If you reset either and it trips a second time almost immediately, leave the unit off and call your HVAC pro to investigate further.

System Airflow Restrictions

Insufficient airflow through your HVAC system can cause a coil freeze-up or compressor shutdown that results in warm air output instead of cool. To solve this, make sure you have a clean air filter installed, and all your supply and return vents are open and unobstructed. Outdoors, clear away any debris and overgrown vegetation on and around the condenser/compressor unit. If these fixes don’t help, your HVAC technician should check for a low refrigerant level, or a dirty condenser or evaporator coil that needs cleaning.

If the A/C in your Coastal Bend home is putting out hot air instead of cool, and adjusting your HVAC settings doesn’t help, contact us at CCAC for expert assistance.

Our goal is to help educate our customers in Corpus Christi, Texas about energy and home comfort issues (specific to HVAC systems). For more information about your HVAC system, download our free Home Comfort Guide or call us at 361-678-2495. 

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    David Mathewst David Mathews is the owner of CCAC Air Conditioning and Heating. A Corpus Christi native... More »