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Ice on an HVAC unit

Troubleshoot: Ice on your AC unit

The sudden discovery of ice on your air conditioning system can be a chilling surprise, and not in a good way. While it may seem paradoxical to find ice on a machine designed to keep you cool, it's actually a common issue that can indicate various problems within your AC system. Understanding why this happens and how to fix it is crucial to keeping your home comfortably cool during the sweltering heat of summer.

What Causes Ice Build-Up?

Several factors can contribute to the formation of ice on your AC system:

  1. Restricted Airflow: When the airflow over the evaporator coil is restricted, such as due to a dirty air filter or blocked vents, the coil can become too cold, causing condensation to freeze on its surface.

  2. Low Refrigerant Levels: Insufficient levels of refrigerant can lead to a drop in pressure within the system, causing the evaporator coil to become excessively cold and freeze.

  3. Faulty Components: Malfunctioning components like the blower motor or the thermostat can disrupt the normal operation of the AC system, leading to ice formation.

How to Fix It:

  1. Turn Off the AC: The first step is to turn off the air conditioning system to prevent further ice formation and potential damage.

  2. Thaw the Ice: Allow the ice to thaw completely before attempting any repairs. This can be expedited by turning on the fan setting on your thermostat without activating the cooling function.

  3. Check Air Filters and Vents: Inspect and clean or replace air filters to ensure proper airflow. Similarly, ensure that vents are unobstructed to allow for efficient circulation of air.

  4. Inspect Refrigerant Levels: If you suspect low refrigerant levels, it's best to call The Air Company to inspect and refill the refrigerant as needed. Attempting to handle refrigerant without proper training can be dangerous and may result in further damage to the system.

  5. Examine Components: Check for any signs of damage or malfunctioning components such as the blower motor or the thermostat. If you notice any issues, contact us to repair or replace the faulty parts.

  6. Schedule Regular Maintenance: Preventive maintenance is key to keeping your AC system running smoothly. Schedule regular inspections and tune-ups with an Air Company professional HVAC technician to catch potential problems before they escalate.


Ice formation on your AC system is a clear indication that something isn't functioning as it should. By understanding the underlying causes and following the steps outlined above, you can effectively troubleshoot and resolve this issue, ensuring that your home remains comfortably cool throughout the summer months. Remember, when in doubt, it's always best to seek the expertise of a qualified HVAC technician to safely and efficiently address any problems with your air conditioning system. Give us a call at 404-583-7788.

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