Evaporator Coil

The evaporator coil sits inside your indoor air handler and is where refrigerant absorbs heat from the room air. As warm air passes over the coil, the refrigerant inside evaporates, pulling heat out of the air in the process — which is how the room gets cooler. If the coil freezes up, it's usually a sign of restricted airflow (often a dirty filter) or low refrigerant. A frozen coil won't cool effectively and can damage the compressor if left unchecked.

Common Questions

What does the evaporator coil do?

The evaporator coil sits inside your indoor air handler and is where refrigerant absorbs heat from the room air. As warm air passes over the coil the refrigerant evaporates, pulling heat out of the air, which is how the room gets cooler.

Why would an evaporator coil freeze up?

A frozen coil is usually a sign of restricted airflow, most often a dirty air filter, or of low refrigerant. Both starve the coil in different ways, and ice forms on a surface that is only supposed to be cold.

What happens if a frozen coil is ignored?

A frozen coil will not cool effectively and can damage the compressor if left unchecked. Clearing the airflow restriction or tracking down the refrigerant problem early is what keeps a minor fix from turning into a component replacement.

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