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Why Is My Air Conditioner Blowing Warm Air?

As temperatures rise again, the last thing you want is for your air conditioner to start blowing warm air when you need to cool things down. It's frustrating and uncomfortable, and it can signal potential issues with your cooling system.

Understanding the reasons behind this problem can help you troubleshoot and possibly resolve the issue without the need for professional intervention. Keep reading to learn more about this common issue.

Have You Checked Your Thermostat Settings?

It might seem obvious, but the most common culprit of an AC that blows warm air is incorrect thermostat settings. First, make sure that your thermostat is set to “cool,” then make sure the selected temperature is lower than your room’s current temperature. If you previously programmed a smart thermostat for the winter, now’s a good time to review those settings and adjust them for warmer months.

Dirty Air Filters Block Cool Airflow

If you can’t remember the last time you cleaned your air filters, that can be a good sign that they might be dirty enough to block the flow of cool air. When airflow is restricted, your AC system’s evaporator coil can freeze, which causes warm air to circulate. Regularly check and replace your air filters according to the manufacturer's recommendations to ensure proper airflow and efficient cooling.

Low & Leaky Refrigerant Causes Cooling Problems

Your air conditioner needs a healthy supply of refrigerant to cool air before blowing it into your home. If there isn’t enough refrigerant, the AC can’t cool the air. A common reason for low refrigerant levels is a leak, which you might not notice because this substance is colorless and odorless. The best thing to do in this situation is to contact an HVAC expert to perform an inspection.

A Faulty Compressor Can’t Complete the Heat Transfer

Your AC’s compressor is a critical component that circulates refrigerant and facilitates the heat transfer between it and air. If the compressor in your system malfunctions or fails to work, the blower may end up sending warm, untreated air into your home.

Dirty or Blocked Condensers Impede Heat Transfer

The condenser unit, located outside your home, releases heat absorbed from the indoor air. If the condenser coils are dirty or blocked by debris, such as leaves or grass clippings, it can impede heat transfer, causing your AC to blow warm air. Regularly clean the condenser coils and ensure adequate clearance around the unit to maintain optimal performance.

Electrical Issues Are Also Common Culprits

Electrical problems such as a tripped breaker, faulty wiring, or a malfunctioning capacitor can disrupt the functioning of your air conditioning system, leading to warm air blowing from the vents. If you suspect electrical issues, it's crucial to turn off your AC and contact a qualified electrician or HVAC technician for an inspection and repairs.

Have a Pro Check for Frozen Evaporator Coils

A frozen evaporator coil can occur due to restricted airflow, low refrigerant levels, or other issues with your AC system. When the evaporator coil freezes, it impedes the transfer of heat, resulting in warm air blowing from the vents. Turn off your AC to allow the coil to thaw, and then address the underlying cause to prevent recurrence.

Contact Us for AC Repair & Maintenance

Meyers Companies, Inc. has many years of experience helping clients resolve issues with their air conditioner systems. Warm air is a common complaint we hear from our customers, and there can be a variety of reasons for this problem. Rest assured, however, that we have what it takes to properly diagnose the issue and deliver a solution that can work within your budget.

For more information or to schedule an appointment, contact us today.