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Why is My Air Conditioner Freezing Up?

Why is my air conditioner freezing up? A frozen air conditioner.

If your air conditioner stops blowing cool air or stops blowing any air at all, check to see if your indoor coil is frozen. What exactly will that look like?

A freeze-up is when a layer of ice forms on the evaporator coil portion of your indoor unit. It can look a bit disconcerting, but don’t panic, it’s repairable.

The ice buildup on your evaporator coil creates the inability for it to move air which affects the amount of air blowing out of your registers. This puts stress on the compressor (the large motor in your outdoor unit). Over time, this can lead to a costly repair or the need to replace the compressor or entire outdoor unit.

At Arise, we can help. First, let’s explore a number of possible reasons for the freeze up:

Insufficient Airflow

Anything that restricts the airflow through your AC system can cause the system’s indoor evaporator coil to freeze. There are a few reasons your air may not be flowing efficiently. The most common problem is a dirty air filter. We recommend replacing or cleaning the air filter once a month. Other airflow problems can be caused by blocked or closed registers, a faulty fan, and/or dirt and debris on the evaporator coil. As they age, evaporator coils need routine cleaning. Our trained and experienced technicians will check your coil during your Preventive Maintenance inspection to determine if it is time for the coil to be cleaned.

Low Refrigerant or Freon®

Another cause for an air conditioner to freeze is low refrigerant. This causes a drop in pressure inside the evaporator coil, which then allows the normal household humidity in the air to accumulate and freeze on the coil. The refrigerant cycle is a sealed system and should never need a “top off.” Typically, a leak in the evaporator coil is the cause of low refrigerant and will require the coil to be replaced. However, the problem may lie in another area of the refrigerant system and may be repairable. Contact Arise and one of our trained and experienced technicians will assist you with the proper diagnosis and repair.

Outdoor Temperature

Often a freeze up occurs when the outdoor temperature here in Cedar Park, TX, drops too low for the unit to function properly. In the spring and fall, if the outdoor temperature drops below your thermostat set point, the indoor system can freeze up. If your air conditioner has frozen, turn the air conditioner off to prevent further damage to your AC system and turn the fan setting on your thermostat to “on” which will allow the ice to thaw. Call Arise and one of our professionals will be able to work on it as soon as the ice has melted completely.

A Word of Caution

As the ice on the evaporator coil thaws out, the resulting water may drip outside of the normal condensation drip channels, causing water damage to your air conditioning plenum, ceiling (if located in the attic) or the floor (if located in a closet).

Call Us Today

Give our Arise professionals a call at 512-267-5000 or contact us online if your air conditioner stops working, whether it’s frozen or for any other reason. We will have it cooling your home again in no time.

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