Why Is My Air Conditioner Frozen in Summer? - Parker & Sons
frozen A/C

Many homeowners have experienced the frustrating and costly issue of a frozen air conditioner. While it may seem like a daunting problem, there are actually quite a few potential causes of an A/C unit freezing up.

In this article, we’ll explore some of the most common reasons why your air conditioner might freeze and what you can do to fix the problem.

Is a frozen A/C always obvious?

 Not necessarily. A good way to tell if your air conditioner is frozen is to check the refrigerant line. If it’s covered in ice, that’s a frozen system! You will see crazy photos online where someone’s entire unit is frozen, but that’s pretty rare. Other signs of a frozen A/C include condensation in the drain pan or on the indoor unit, or … well … the A/C not working is a pretty good sign that this could be the issue!

Why does a frozen A/C happen?

One of the most common reasons for an A/C to freeze is simply because your filter is dirty or clogged.

How the heck are these two things connected? Well, a dirty or clogged filter will restrict airflow to your unit. The way your air conditioner is supposed to work is that the warm air from indoors gets taken into the return vent, through the filter, and over the evaporator coils, which removes the heat from the air. The refrigerant is what absorbs this heat, causing the refrigerant to turn from a liquid to a gas.

However, suppose your dirty air filter makes it impossible for air to flow through. In that case, not much air is blowing over the evaporator coils, and the refrigerant can’t turn into gas like it’s supposed to … instead, it freezes!

Another thing that could be impacting airflow is a leak in your return vents. These are the vents that allow air to be sucked into your unit in the first place. If these are leaky, again, not enough air is moving, and you guessed it … the A/C freezes.

What do I do?

So, a frozen A/C is almost always an airflow problem, whether the culprit is a clogged filter or another reason.

The good news is that this problem is relatively easy to fix! First off, change that dirty air filter! Then, power off your A/C at the thermostat and switch the fan to “on.” That way, the air conditioner is blowing warm air, quickly allowing the system to thaw, heating the evaporator coil and the refrigerant.

Give this process a day, then turn your regular A/C settings back on.

Call Parker & Sons

However, if thawing the system manually doesn’t seem to be doing the trick, it’s time to call in a professional. We can look at your unit and figure out if something more serious is going on, like a leak in your return vents.

A frozen A/C is never fun, but we hope this article has given you some clarity on what might be the problem! You don’t want a frozen A/C, especially in summer! Just call the Phoenix and Tucson pros online, or give us a call! (602) 273-7247

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