What Causes an AC Unit to Freeze?

It’s no surprise that our AC units have been working overtime these last few months. During the summer in the Kentuckiana area, the heat and humidity can make it uncomfortable outside, and we turn to our air conditioner to keep our homes cool and comfortable. Unfortunately, this can sometimes lead to a frozen AC unit. This means that the evaporator coil inside the unit has frozen. This typically happens due to airflow restriction caused by dirty or clogged air filters, closing off supply or return vents, etc. 

When the evaporator coil freezes, it prevents it from transferring heat outside of your home, which then causes the coils to freeze. Read on to learn about what you should do if you suspect that your AC has frozen. 

  • Never attempt to thaw out the unit by turning your thermostat up to a warmer temperature. 
  • The first thing you should do if your AC freezes is turn off your unit at the thermostat.
  • Once, your air conditioner is turned off, check your air filters to see if they are clogged or dirty. If needed, replace them with new filters. 
  • Make sure all registers and vents are clear and unblocked from furniture, drapes, and any other items in your home. 
  • If you find that there is a refrigerant leak, you will need to call a professional to make repairs. 

If you suspect that there is a problem with your AC or that your AC unit has frozen, call Automatic Air. We will send out a professional to inspect your HVAC unit, detect the problem, and fix it as quickly as possible.