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Why Do Air Conditioners Freeze Up?

two man installing air conditioner

It might sound unusual, but your Huntsville, AL, home’s air conditioner could get too cold. A frozen air conditioner can’t remove heat from your house. Read on to learn about three reasons why your air conditioner has frozen up.

1. Poor Airflow

Poor airflow is a leading cause of frozen air conditioners. A problem with the fan or motor may cause a lack of airflow over the coils. A dirty air filter also reduces airflow. Rarely, a collapsed or broken air duct reduces airflow over the air conditioner’s coil. When there’s not enough airflow, there’s no warm air passing over the coil. The compressor keeps running, which makes the coil get even colder.

2. Refrigerant Leak

A refrigerant leak may cause the outdoor coil to freeze. In a leak situation, the low pressure of the refrigerant causes a flash-freezing event. This causes ice to build up on the copper pipe of the outdoor unit. The ice will keep building up until the air conditioner’s safety system triggers it to automatically shut down. If you see ice on the outdoor unit, turn off your air conditioner and call for an urgent repair.

3. Dirty Coil

A dirty coil may cause the air conditioning system to freeze. A layer of dust can get onto the coil if you skip a maintenance visit or run the unit with a clogged air filter. The coil is usually damp from the cold refrigerant encountering humid air passing over it. The dust creates a sort of blanket that keeps the coil cold. Eventually, it gets cold enough to freeze the condensation, which turns into ice.

At Alabama Climate Control, we’re a trusted air conditioning repair company in Huntsville. You can also count on us for heating repair, heating and air conditioning maintenance, and installation. Our indoor air quality, humidification, air purification, and duct design services are designed to optimize your comfort. For more details about why your air conditioner has frozen up, get in touch with us at Alabama Climate Control today.

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