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Why is My Air Conditioner Freezing Up? 4 Common Explanations

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Jerry Kelly Break Up With Furnace

Have you ever checked on the indoor portion of your air conditioner after suspecting a problem and discovered that it’s all covered in ice? Air conditioners operate when temperatures are warm, so what on earth could cause your system to freeze up? This is a much more common problem than you might expect, and it can happen for a number of different reasons. Today we’re going to help you understand this perplexing issue by answering the question, “Why is my air conditioner freezing up?”


Freezing typically occurs on the evaporator coils


When air conditioners freeze up, the ice is almost always located on and around the system’s evaporator coils. An air conditioner’s evaporator coils contain cold refrigerant inside of them. When warm air from your home is blown over those coils, the heat from your home’s air transfers to the evaporator coils and the coils warm up when that heat is absorbed. As a side effect of this process, moisture from the air is removed and drips off of the coils in the form of condensation.


If something is wrong with your air conditioner that is preventing your evaporator coils from absorbing enough heat, the condensation that builds up on them can freeze over because the refrigerant inside of the coils stays cold. This results in evaporator coils that look like they are covered in snow.


Why is my air conditioner freezing up?



How can you prevent your air conditioner from freezing up?


The best way to prevent your air conditioner from freezing up is to schedule a tune-up every year. During your tune-up, we’ll check your system’s refrigerant levels, inspect the blower motor and clean your coils so that the heat transfer process can execute with ease. In addition, make sure to change your air filter regularly and keep all of your air registers open and clear of obstructions so that your system doesn’t operate with any airflow issues.


If you have any questions about why your air conditioner is freezing up, or if you’d like a cooling system serviced or installed in your home, contact Jerry Kelly, your St. Louis area air conditioning contractor. We provide service all over the St. Louis area, including towns like Clayton, Cottleville and Creve Coeur, MO.


photo credit: mirsasha via photopin (license)


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Kimberly G.
01:51 22 May 22
I had my ac tuneup for the Dpring. Aaron was very professional and thorough. He did great work.
K M.
20:14 21 May 22
Erik was very helpful in explaining what was wrong with my A/C unit. Was thorough and efficient, very knowledgeable.
bryan D.
18:23 21 May 22
Mike C came out and fixed our ac in a timely and professional manner. Very happy with the service he performed.

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