AC Freezing

Help Prevent AC Freezing

CategoriesProducts / Tips

If the air conditioner freezes, you’ll notice a significant drop in cool air flowing throughout the house and you’ll likely see a build-up of ice on the outdoor unit and the evaporator coil which sits above the furnace. If your coil freezes up, this may result in water pooling around the furnace that could potentially damage the system’s controls. If the drain from the coil is plugged, this could also result in large volumes of water building up in the basement. If you see ice or freezing on either the inside or outside portion of your AC, you should immediately turn off the cooling system and contact a professional to inspect the unit and minimize any further damage.

Several issues could be causing an air conditioner to freeze:

Low Refrigerant Levels – A refrigerant leak or improperly charged system can cause low refrigerant levels which can lead the evaporator coil to get too cold and cause the whole unit to freeze. Refrigerants can only be added by certified and licensed professionals

Insufficient Fan Speed – The fan must be blowing fast enough to keep the proper amount of air flowing over the evaporator coil. If the fan is too slow, the AC might freeze. If this is the issue, a technician can increase the fan to the correct speed.

Refrigerant levels and fan speed are usually checked and addressed by a professional cooling technician during an annual AC maintenance appointment. That’s why it’s so important to schedule these yearly preventative maintenance bookings.

Clogged Furnace Filter – A clogged filter can restrict airflow, cause stress to the system and ultimately be responsible for the AC freezing. Check the filter regularly and replace (or clean) as required to keep air moving freely throughout the system. Typically, most 1” disposable filters should be changed once a month.

Closed Vents & Registers – Some people close vents and registers in unoccupied rooms as a way to save money on energy costs; however, this can actually cause the system to freeze due to imbalanced airflow. Make sure to consult a professional before closing vents and registers in your home, or ask about other ways to provide zoned cooling.

If your air conditioner is frozen and you need to have it inspected,
don’t hesitate to contact HAMCO Heating & Cooling Ltd.

We have been serving the heating and air conditioning needs of Hamilton, Burlington, Oakville, Grimsby and Brantford areas since 1946.

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