Reason why Air Conditioner unit freezes and how to prevent it from happening

They are often asked why the air conditioner freezes. Finding out the cause of alternating current freezing can be frustrating, but it is not an unusual problem. There are several reasons why an air conditioner can freeze.

It doesn’t matter if it’s a window air conditioner or a central air conditioner – the causes and solutions for a freezing air conditioner are the same all the time. It is essential to solving this problem.

Not only does a frozen air conditioner fail to cool properly, but it can also be severely damaged if it continues to freeze. If you have this problem, you should fix it immediately – it will not go away on its own. This article will tell you why the central air conditioner freezes and how to repair it.

How the air conditioner freezes

Get ready for a little physics lesson in high school. We don’t need to dig deeper, so take me with you, but understanding this principle is essential to find out why the air conditioner freezes.

The Joule-Thompson effect is a principle in thermodynamics that states that when everything else remains stationary, as the gas increases, its pressure reduces, as does its temperature. When the gas is compressed, its temperature also rises.

This is because what we perceive as the temperature is just a measure of the amount of energy a molecule possesses. Quite only if the air particles jumped quickly, that air would be hot. If the air molecules move slowly and slowly, you will see this cold air. So easy.

So what?

It is essential to understand this because it is the basis of how your air conditioner works. Their system works in a way that allows the evaporator coil to expand the coolant inside, which causes the coil to cool quickly.

When this cooled coil quickly comes in contact with the air in your home (which the air conditioner blows through this now cooled coil), the coolant will absorb the heat from the air in your home.

This reheated coolant is then transferred outside your home, where it is compressed, which causes it to heat up and transfer heat from inside your home to the outside air. Then the cycle is always repeated and cools your house in this process.

Why is this important?

Well, because this effect is used to allow the air conditioner to cool the air in your home. But every time you change any part of the equation, you can throw the balance of the system.

To simplify this, the air conditioner freezes because something has changed your approach to cool the evaporator coil too much, causing the unit to freeze.

Now that you know-how, you need to know why the air conditioner freezes and, to do that, you need to know what caused the imbalance of the air conditioning system. We will do this in the next section.

Reasons for freezing the air conditioner

Rely on air conditioning in the summer months to keep your home cool and comfortable. However, this is not possible if you have problems with the air conditioner.

One of the most common AC problems is blocking devices. You can see if you notice frost on the copper tube of the unit or other components of the air conditioner.

If you find that the air conditioner is frozen, it is essential to determine the cause. However, before doing this, you must turn off the air conditioner until the ice or ice formed on it melts.

It may take some time. Here are some of the leading causes of air conditioning freezing.

1. Low refrigerant level

Often, the refrigerant in an air conditioning system depends on the right pressure to function correctly. During regular operation, water vapor can condense on the outside of the pipes that carry the coolant.

However, if the pressure changes for any reason, the coolant may operate abnormally. In such a case, the coolant can cause the air outside the tube to condense and then freeze.

You may not notice this right away, but over time, ice can build up in and out of the strip. This affects the flow of cold air inside you.

This problem can be solved by checking and restoring the refrigerant level. You need a professional heating and ventilation contractor in Greenville to get the job done.

2. Bad exchange

The drainage system in the air conditioner is used to remove condensed water from the air conditioner. If this doesn’t go smoothly, water will begin to pool in the air conditioner.

Leakage problems can arise when dirt or other foreign matter clogs the drainage system. It can also be the result of loose pipes and drainage pipes. Water leaking from the sewer system can freeze or build up in AC components.

A simple solution to this is to check the AC drainage system regularly. Make sure there are no leaks in the drains and that the drain is not clogged with debris.

3. Bad airflow

Airflow around the air conditioner is essential for regular operation. The airflow brings hot, humid air into the air conditioning system, which is then conditioned.

If the AC system does not receive sufficient airflow, the device will overcool and freeze. The solution to this is simple enough: make sure the AC units have good airflow.

4. Clogged air filter

The air filter is one of the most critical components of an air conditioning system. It is responsible for preventing dirt, dust, and any air debris from reaching into the indoor air through the air conditioner.

However, the air filters quickly become clogged with dirt and need to be changed frequently. Otherwise, they will block airflow in the air conditioner. This clogging causes the cooled air to stay on the AC power lines longer, causing condensation and ultimately leading to frost or ice.

A simple solution to this is to maintain and implement an AC air filter replacement program. For most filters, this should be done about every three months. Most filters need replacing, although some are washable and can be reinserted after washing.

5. Thermostat settings

In many cases, AC freezes are the result of low thermostat configuration. If you set the thermostat too low, the air conditioner will blow out the cooled air, which inevitably leads to increased cooling and condensation.

This can also be caused by the fact that the alternating current is operated for a sufficiently long period at a reasonably low temperature.

You can solve this problem by making sure the thermostat is not set too low. If the AC power needs to be used for an extended period, developed a program or periodically turn it off with a programmable thermostat.

Hire trusted HVAC suppliers.

If your air conditioner is experiencing freezing issues, you need the help of a professional HVAC contractor. As mentioned above, AC power outages can have a variety of causes.

A professional heating and ventilation expert will carefully examine your HVAC unit to determine the exact cause.

6. Blocked airflow

Inadequate airflow is often responsible for freezing the air conditioner. This means that no air is moving through the system. The absence of airflow means that nothing is preventing condensation from condensing on the evaporator coil.

If something prevents air from flowing across the ring, it will become freezing and freeze.

In several cases, limited airflow is the end of dirty air filters or even closed feed logs. To make sure that this is not the case in your home, change the air filter every month and keep records of utilities open when using the air conditioner.

How to repair a frozen air conditioner?

Just because the air conditioner freezes doesn’t mean you have to contact the HVAC contractor. Any contractors shall tell you that they are the only ones touching your HVAC unit (I couldn’t believe it).

If you do not feel comfortable around the air conditioner, you should contact the contractor. In any case, you must first turn off the air conditioner and allow it to thaw. Ice can damage your air conditioner!

If you are comfortable and even aware of the man’s mistake, there are a few things to check before calling your local air conditioning repair service. To troubleshoot a freezer air conditioner, we recommend that you follow these steps in the order provided:

First of all, I want to ensure that the air conditioner is never turned on when the outside temperature is below 62 degrees. Otherwise, stop it and see if you fix the problem.

This is the easiest solution to fix the problem, but it can cause big problems. If the air conditioner freezes due to restricted airflow, then you must exclude this.

Steps of how to repair a frozen air conditioner

1. Check the air filter of the air conditioner if the air conditioner freezes.

This is one of the most common reasons for restricting the flow of air through the air conditioner. You should use a high-quality air filter and replace it every two to three months.

If the air conditioning filter is clogged, restricted airflow can cause the system temperature to drop below optimal levels and the air conditioner to freeze.

2. Check the coil file if the air conditioner freezes.

A dirty coil (inner ring) can cause shortness of breath, low temperature, and freezing of the air conditioner. It is also a recipe for some of the other uncomfortable problems with conditioning, such as dirty sock syndrome.

We recommend that you clean the file as the next step in troubleshooting the refrigerator air conditioner. You can learn how to do this in this article:

3. Next, you need to check for airflow restrictions at your facility.

First, open all air conditioning records (ventilation holes in the roof). Any restriction on airflow can freeze the air conditioner. So you should also check the lines for leaks, bends, or separate parts.

To do this, you will probably go to your attic. Be careful – if you have never walked on it, ask a friend who knows how to do it and make sure you only go on the crossbar!

4. Check for foul lines

If all your lines are OK, remove one of the records and look inside. I’m not a big fan of air duct cleaning, but sometimes this may be necessary if you or the previous owner didn’t use high-quality air filters correctly.

I would have only renewed the fonts – cleaning the fonts does not work well and can damage your fonts.

If the air conditioner still freezes behind following the steps above, unfortunately, you did all you could in this Do It Yourself category. Contact an HVAC contractor.

The following possible causes are a low-pressure system due to low refrigerant, too much refrigerant that can only be topped up by a licensed HVAC technician, or you may also have a problem with the fan or dealer plumbing. Too cold. Nothing to confuse yourself with.

Don’t pay too much for a new air conditioner.

Unfortunately, if you’ve followed the steps above with no result, it may be time to consider a new air conditioner. Check with your local HVAC contractor first, but I wouldn’t speak to anyone without knowing the facts first.


We are often asked, “Why is the air conditioning freezing?” We hope this article has answered your question and provided you with some helpful information about what can cause your air conditioner to freeze and how to fix it.

In addition to working correctly, a frozen air conditioner can damage your device. Think about what road ice does over time – it expands and destroys you. He disassembles them and can do the same with the air conditioner. This doesn’t work on its own.

So quit it, follow the steps above, and you have a healthy air conditioner that has been working for years.