What Causes An Air Conditioner To Freeze Up?

An AC precisely controls temperature, pressure, and airflow. This refrigerant system that creates the cold air can overclock and freeze itself if some things are out of balance.

The AC will either blow warm or cool air or nothing at all if it is frozen. Surely you’re wondering why this might be true, and we’re here to explore the reasons in depth and what you should do.

How does Your Air Conditioner Generate Cold Air?

An AC’s key component is its coil, which contains extremely cold refrigerant. A warm airflow is required to activate the refrigerant. Your air is cooled, and your coils are kept warm enough so that they do not freeze over. With a straight cool system, the indoor coil removes heat from the inside and transfers it using the refrigerant to the outdoor coil, which pushes the heat outside.

The coils can freeze up quickly if something prevents warm air from blowing over them or if the pressure inside the coils is incorrect. It may be due to airflow, pressure, or a combination of both that your AC becomes a frozen icebox. Therefore a regular AC service in Miramar, FL, is a must.

Causes of AC Freezing Up

Lack of Airflow

Lack of airflow is the number one reason your AC can freeze. It can be caused by several malfunctions, from the blower motor to the air intake. Your AC will start to freeze if anything in the air flow system prevents warm air from flowing over the coils while the compressor is running.

Dust Blocking the Coils

Running without an air filter, using a low-quality filter, or not changing your filter carries risks. It is common for AC refrigerant coils to become damp due to moist air condensing on their cold surfaces. 

In damp coils, dusty air builds up into a thick blanket. The dust acts as an insulator, trapping the cold inside the coils and causing excessive cold. The icebox effect can occur in combination with more moisture building up on the dust.


Low on Refrigerant

Your air conditioner’s ability to manage pressure is directly related to the refrigerant level inside its coils. When there isn’t enough refrigerant, the flashing occurs too early due to a lack of pressure. At that moment, the flashing process creates enough cold to condense moisture onto the coils, which instantly freezes them. 

As the flashing occurs early, ice builds up until it engulfs the AC and creeps up the copper pipes. Maintaining the proper refrigerant levels in your AC system is extremely important. Get in touch with a professional for AC repair in Miramar, FL.


Air Conditioning ProTech Corp knows everything there is to know about air conditioners. Whatever kind of air conditioning system you need, whether it’s a mini-split or something else, we can help. Contact us today to learn more about AC tune-up in Miami Gardens, FL.