Why is my AC unit freezing up? 5 common causes

Are you a homeowner who’s been dealing with an air conditioner that has frozen up this hot summer? This can be an incredibly frustrating and uncomfortable problem, as it not only results in reduced air flow coming from your AC unit but also increases your energy bills. Thankfully, fixing the issue can often be easier than one might expect — if you know what to look for. 

In this blog post, we’ll explore 5 common causes of AC freeze ups, arming you with the knowledge needed to fix the issue and get back living comfortably in no time! You can also visit the following website for tips on preventing AC freezing: https://www.hurlimanheating.com/blog/2022/may/how-do-i-keep-my-air-conditioner-from-freezing-u/

The AC unit is not receiving enough air flow

If your AC unit is freezing up, it may be a sign that the airflow has been compromised. This could occur due to a clogged filter, restricted vents, insufficiently sized equipment, or inadequate insulation around the ducts. Before replacing the system, it’s important to gain an understanding of blocked air flow and its causes – by identifying the root cause of your AC problem you can take necessary steps to restore the air flow. 

In some cases it might be as easy as replacing the air filter or clearing blockage from vent covers. Additionally, checking for other signs of insufficient airflow like inconsistent temperatures between rooms might help you narrow down the underlying problem. Taking action and correcting airflow issues can greatly benefit your home and wallet – especially if costly replacements are not necessary for resolution!

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There is a blockage in the air conditioning ducts

When an air conditioning duct becomes blocked, it can quickly cause temperatures to rise in the area it services. If not dealt with promptly, greater damage can occur from the mechanical strain caused by poor airflow, such as a reduction in efficiency of the system or worse yet, complete failure. Blockages can often be tricky to identify and can range from debris which has gotten stuck inside to damage caused by pests or construction work. 

In order to correctly diagnose any blockages, professional technicians should always be called in for their expertise. Not only are they able to swiftly identify potential issues but their specialized tools and knowledge also allow them to get straight to the root of any problem thus rectifying it quickly and efficiently.

The AC unit is low on refrigerant

Keeping your AC unit up and running not only ensures that you stay cool during the summer but it is also important in keeping refrigerant levels regulated. Refrigerant, a chemical compound primarily used to cool and pressurize air functions as one of the main components of an air conditioner system. Without it, air conditioning systems wouldn’t be efficient at doing their job: keeping you cool. 

Low levels of refrigerant can cause a variety of trouble for an AC unit, from a decrease in airflow to higher energy costs due to the system working overtime. Maintaining your refrigerant levels is essential in keeping your AC running smoothly and efficiently; if you ever suspect that your AC unit may be low on refrigerant, contact a professional HVAC technician to have them come out and run a diagnostic test.

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The AC compressor is malfunctioning

If the AC compressor of your air conditioner is malfunctioning, it’s going to be difficult to keep your home cool. The compressor is one of the most important components in an AC system; it pushes refrigerant through the evaporator, where heat from the house is absorbed and pushed outside. If the compressor isn’t functioning properly, then the system won’t be able to cool adequately, and there is a chance that your AC could freeze up as a result. 

Make sure you contact a licensed technician to inspect your AC unit, so they can diagnose and repair any faults with your system as soon as possible. The sooner you diagnose and fix a malfunctioning AC compressor, the better your chances are at restoring it to full efficiency without compromising longevity.

The thermostat is set too low 

It’s very important to make sure the thermostat in your air conditioning unit is set to the right temperature. If it’s set too low, the AC can freeze and stop cooling the house altogether. Regular maintenance of your AC unit is key – check and clean out any dust or particles that have built up in your filters and clear away any debris from around the exterior of your unit to ensure proper airflow. 

Make sure you’re also setting your thermostat at a comfortable but not too cold temperature so that it does not freeze up your AC. Being on top of regular maintenance checks will ensure that you don’t have to worry about a frozen air conditioner this summer!

See also  HVAC Low Air Flow: Causes & How to Fix


Your AC unit is an important part of your home and when it’s not working right, it can be a pain. Fortunately, there are usually only a few reasons why your AC unit would freeze up and they’re all fairly easily fixed by either you or a professional. Next time your AC starts to act up, check for these five possible culprits before calling in the professionals. And as always, make sure to consult your local HVAC company to schedule maintenance or servicing so that you can avoid any future headaches caused by a freezing AC unit.

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