Why Air Conditioners Freeze Up, And How To Solve The Problem

The weather is finally heating up in the desert, and fast. With temperatures climbing to 100 degrees and up, nothing is worse than having an AC unit that suddenly stops working. One reason your AC might quit on you is by freezing up.

An air conditioner freeze up occurs when ice forms on the coils while the unit is running. If left unattended, an air conditioner can shut off or suffer serious damage during a freeze up. There are multiple conditions that can cause your air conditioner to freeze. Knowing the causes and how to address the problem if it occurs could save you major money on repairs and air conditioning replacements. Learn why air conditioners freeze, and what you can do to prevent it to keep you from sweating it out in the heat this summer.

Blocked airflow is the first reason your AC unit could freeze up. Lack of air flowing through your air conditioner can cause the temperature of your AC’s coils to drop below freezing. The warm air normally moving through your return ducts passes over your cold refrigerant coils and loses heat in the process. As much as the coil works to cool the air, the warm air works to thaw the coil. When that warm air isn’t present, because of small ducts or blocked filters, the coils cool down and moisture in the air will freeze the coil. Regularly changing the filter should be enough to avoid a frozen air conditioner.

Leaking refrigerant can be another problem. In order to keep your HVAC system running correctly, the amount of refrigerant inside needs to be balanced. If you are low on refrigerant, it is possible that there is a leak in your line. If you suspect a leak, it’s not a good idea to add more refrigerant until you’ve contacted an HVAC specialist to inspect. Adding more refrigerant to a leaky line will compound an existing problem.

Another issue can arise when it’s hot during the day, but cool at night. When the temperature drops below 60 degrees in the early summer or late fall, generally at night, your air conditioner can suffer. Rather than run the air conditioner during the cool night hours, turn it off to keep it in working order, while also saving you some money. Other causes of possible freezing could be anything from a faulty thermostat to a slow or broken blower fan. You should consult with a professional if you suspect either of these issues are occurring with your air conditioner.

So, what do you do if your air conditioner is frozen? The first thing you need to do if you suspect your AC is frozen is turn it off, allowing it to defrost and preventing any further damage to the system. No matter the cause, keeping your air conditioner running while you trouble shoot the problem can cause further damage.

Check all your air filters and your refrigerant levels to determine if either are the cause of your problems. If you have dirty air filters, replace or clean them and trouble shoot your air conditioner from there. If your refrigerant is low, call a professional before adding more. No matter what the cause, a professional should be able to fix your air conditioner, or replace it if serious damage has occurred.

Avoid a freeze-up this summer, and keep your air conditioning repair bills to a minimum with a system that is well-maintained.


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