Why Frost Forms on Your Air Conditioner

Your air conditioning system can’t cool your Woodbridge, Virginia, home efficiently if frost or ice on the evaporator coil blocks airflow. Even in the middle of summer, frost can form on your air conditioner when the temperature of the refrigerant falls below freezing. Frost and ice could cause severe damage, so you should turn off your air conditioner and contact a professional if you notice this problem. Here are some of the most common causes of frost on your air conditioner.

Restricted Airflow

Your air conditioner cools your home by absorbing heat from the indoor air. If your system can’t move enough air over the evaporator coil, then the refrigerant will make the coil too cold, eventually forming frost. A dirty air filter or evaporator coil can restrict your air conditioner’s airflow. You should check your filter once per month and keep debris such as leaves or grass clippings away from your unit. Too many air registers that are closed or blocked by furniture could also restrict airflow.

Low Refrigerant

A low refrigerant level causes the temperature of the refrigerant to fall as well. As a result, the evaporator coil will become colder than normal as air condenses over it. This condensation will turn to ice if the problem isn’t remedied. A certified professional will need to check your refrigerant level, repair any leaks, and refill it as needed.

Thermostat Problems

Thermostat trouble could impact the cycling of your air conditioner which would, in turn, affect the volume of air passing over the coils. This not only wastes energy but could also result in ice buildup within the unit.

You could also be setting your temperature too low at night. If your thermostat is next to a window that gets lots of sun, then the temperature on the thermometer will be higher than the temperature in your home and your system will run when it doesn’t need to.

Brennan’s Heating and Air Conditioning has been giving homeowners and businesses award-winning service since 1979. We can help you install, maintain, and repair your HVAC system. Call us today at 703-783-0145 to schedule an appointment or if you need emergency service.

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