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What to do if you encounter a Frozen Evaporator Coil in your Air Conditioner

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Heating And Air Conditioning Training Group

In last week's blog, one of the common air conditioner problems that we mentioned was a frozen evaporator coil. This problem is so common, in fact, that we thought it deserved its own post! So today we're going to talk about why evaporator coils are susceptible to freezing and what you should do if it ever occurs in your home.

Why does a frozen evaporator coil occur?

Your evaporator coil is responsible for absorbing heat from your home's air. When this happens, condensation naturally builds up on your coils. Normally this isn't a problem. But if something goes wrong with the cooling process, that condensation can freeze over and cause your air conditioner to break down.

Why does an air conditioner freeze over?

An air conditioner usually freezes over because:

  • Your air filter is clogged. 
  • Your evaporator coil is dirty. 
  • You have a refrigerant leak. 

If you notice your air conditioner has frozen over, you should get an HVAC technician to come diagnose and repair your air conditioner right away. To get your air conditioner repaired, contact us today.

How do I stop my air conditioner from freezing up?

To stop your air conditioner from freezing up, you can: 

  • Replace your air filters regularly. 
  • Have your AC unit inspected often. 
  • Have your AC unit cleaned regularly.

Getting your air conditioner serviced on a regular basis is the best way to prevent your air conditioner from freezing up. To find out more about getting your AC unit repaired or serviced, call us today. 

At what temperature will an AC unit freeze?

An AC unit will typically freeze when the outside temperature is lower than 62 degrees. However, there are other reasons your AC unit may freeze aside from the temperature outside. If your air conditioner has insufficient air flow, a dirty air filter or a refrigerant leak, it can also end up freezing over. To ensure you cover all of your bases, you should have your air conditioner serviced at least once a year to ensure that it is clean and working properly. To get your AC unit repaired or maintenanced, give us a call today. 

What are the potential causes of a frozen evaporator coil?

  • Inadequate system airflow. One of the most common causes of a frozen evaporator coil is lack of system airflow. This can be due to anything from closed off air registers to a malfunctioning air handler. If there isn't enough air blowing over your evaporator coil, the coil won't have enough heat to absorb. This will cause the condensation on the coil to freeze over.
  • Dirty air filter. A dirty air filter will restrict airflow to your system, which will cause the same problems we listed above. In addition, a clogged filter can allow dirt to build up on your evaporator coil (below) and lead to freezing.
  • Dirty evaporator coil. If dirt builds up on your evaporator coil, the coil will have a hard time absorbing heat from your home's air. Without that heat, your coils will get too cold and freeze over.
  • Low refrigerant. If your system doesn't have enough refrigerant (either due to a leak or an improper refrigerant charge), it will not be able to perform properly. One of the most common symptoms of low refrigerant is a frozen evaporator coil.

What should you do if you experience a frozen evaporator coil?

If you notice that your evaporator coil has frozen over, contact Jerry Kelly so we can find the source of the problem. It's helpful if you turn off your air conditioner before we arrive at your home so that it can defrost by the time we get there. After we discover the source of the problem, we'll fix it and advise you on how to avoid it from happening again!

If you have any questions about the proper placement of your thermostat, or if you'd like a cooling system serviced or installed in your home, contact Jerry Kelly, your St. Charles, MO, air conditioning company. We service the St. Louis area, including towns like St. Peters, Town and Country and Weldon Spring.

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