Why Do Air Conditioners Freeze Up?

Why Do Air Conditioners Freeze Up?

15 Feb 2013

One of the most common questions asked HVAC professionals is why AC units freeze up. A homeowner may notice that the air conditioner is not cooling the home like it should. The homeowner checks the components only to find ice has formed on the evaporator coils.

If ice has formed on the coils, turn off the unit and allow the unit to sit and thaw out. Do not continue to run the AC unit if you notice a freeze up. Leave the unit off for two to three hours. 

Lack of Airflow

Air conditioners may freeze up for several different reasons. The most common reason why air conditioners freeze up is the lack of air flow to the system. Many times, an air conditioner will freeze up if the filter is excessively clogged. A clogged filter will block the flow of air to the air conditioner. The result can be AC freeze-up. 

Check the filter and clean or change it if it is clogged. Check the flow of air into the registers and out of the vents. If you notice that air is not flowing through all of the vents and registers, you may need to have your ductwork inspected for damage. Call Bodine-Scott Air Conditioning Company to have your ductwork and HVAC system inspected by a certified HVAC professional. Knowing why air conditioners freeze up should reinforce the importance of cleaning or changing the AC filters at least once per month. 

Lack of Refrigerant

Another reason why air conditioners freeze up is a low refrigerant level. However, because the AC system is a sealed system, refrigerant should not leak. If your system is low on refrigerant, you have a leak in the lines or in your equipment. Call Bodine-Scott and we will dispatch a certified HVAC technician to your home. The technician will identify the leak, repair the issue and recharge your system with refrigerant. 

Lack of Proper Maintenance

Your air conditioner needs regular preventative maintenance just as a vehicle requires regular maintenance. During a maintenance tune-up, the technician cleans your components, including the evaporator and coils. If a lot of debris travels through the air in your home, your evaporator coils can become caked with dirt and debris. Extremely dirty evaporator coils may be one reason why air conditioners freeze up. During a preventative maintenance check, the coils and surrounding area are cleaned. Components and parts are lubricated and the flow of air to and from the system is tested. An annual preventative maintenance tune-up can keep your equipment performing at its best. 

If your air conditioner is freezing up and you need an expert opinion, call Bodine-Scott Air Conditioning Company. Bodine-Scott provides heating and air conditioning service for all brands and types of equipment. Our skilled, certified technicians are knowledgeable and friendly. Whether your air conditioner is in need of repair, you would like to explore a new HVAC installation, or if you would like to schedule your annual preventative maintenance tune-up, call Bodine-Scott today.

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