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Allen’s Trusted HVAC Pros Explain Why Your A/C Keeps Freezing

HVAC Company in Allen, TX Answers the Question Why Air Conditioners Ice Up

McKinney, United States – April 8, 2021 / Harris Air Services LLC /

Why Does My Cooling System in Allen, TX Keep Freezing?

A freezing A/C is a common problem, and often homeowners don’t realize it can be harmful to their unit. If your system is freezing up, it needs to be serviced, then call a qualified HVAC company in Allen, TX, right away.

This problem happens due to a variety of reasons. Keep reading below.


Your air filter is filthy

If you suspect this is the problem, turn off your system. Do not make the mistake of changing the air filter and turning the unit right back on. If you have seen ice, it will take 4-8 hours to thaw completely. If the air filter was the issue and not thawed out, the unit will continue to freeze.

Just because ice has melted on the outdoor unit does not mean the machine has thawed. The ice starts in the evaporator coil (inside your attic) and then travels down the refrigerant lines to the outdoor unit. You cannot see your evaporator coil; it’s inside of the indoor unit.

You also need to schedule a duct cleaning in Allen, TX, to allow good airflow and lower your utility bills.

Failed indoor blower motor

If the blower fails, not airflow is present. Many things can cause the motor to stop working. Sometimes it’s the motor itself, or there is something that is causing it not to run. Turn off your unit and call for AC repair immediately.

Low refrigerant charge

This requires a qualified technician to diagnose. If your air conditioning system is low on charge, there is a good possibility it is leaking. A technician can check for a leak and help with a solution.

Stuck contactor in the outside unit

This can happen when it becomes “pitted” due to usage and age. It can weld itself together, and the outdoor unit never stops running. When the indoor unit stops running, the system will immediately start to freeze because there is no airflow.

Contactors are like spark plugs on cars; they do not last forever. We check contactors on our tune-up and maintenance visits. If they are showing signs of wear, we suggest replacing the part. Call a trusted expert to service your heating and cooling in Allen, TX.

Bad thermostat

If the thermostat control is not sending the correct signals to the indoor and outdoor unit, it can result in your AC freezing up. Call for service and have a technician figure out what’s going wrong.


Some sort of airflow restriction

Possibly some insulation loses somewhere in the system. A service person would need to take apart the indoor unit to diagnose if that is the problem.

This list is limited but covers the most common situations that could make your A/C freeze up. Call Harris Air Services today if you are experiencing any of these issues 469-325-1034.


Harris Air Services is your best resource for heating and air conditioning services in McKinney, TX, and the surrounding areas. We are a locally owned and operated company that specializes in residential HVAC installation, repair, and maintenance. In the McKinney, Texas area, homeowners find that doing business with Harris Air Services is a smooth ride every time.

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