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What Could Be Causing My AC to Freeze?

Helms Heating & Air Conditioning - Thursday, April 05, 2018

What you need to know when your heating and air conditioning system gets a little too cold.

Heating and air conditioning systems are awesome, and we can’t live without them. Until something goes wrong. If your air conditioner decides to freeze up, what could be causing it? Let’s take a look.

Insufficient Airflow

For your air conditioner to function, air has to be able to pass over the evaporator coils, cooling the air before distributing it throughout your home. Compromised airflow means the heat exchange process can’t work as it should. When this happens, the temperature in the system from the underutilized Freon continues to drop, causing the air conditioner to freeze up.

Refrigerant is Low

The Freon in your AC unit expands to cool the air before sending it through the system and the vents into the rooms of your home. If the Freon level gets too low, it can cause over-expansion of the refrigerant. This creates an even lower temperature in the unit, which can cause the moisture in the air to freeze when it comes in contact with the evaporator coils. This results in ice on the outside of the unit.

Equipment Issue

There are lines within your AC unit that allow the refrigerant to flow. If one of these lines gets a kink in it, it can cause the temperature to drop and the system to freeze. A faulty blower fan or a dirty or clogged air filter can also cause freezing by preventing proper air flow within the unit.

You want your air conditioner to be cool, but not too cool! If your AC freezes or you have any other heating and air conditioning issues, contact our team at Helms Heating and Air Conditioning to solve any of your HVAC problems.