Definition
The indoor coil where refrigerant absorbs heat from your home's air. When it ices over, you lose cooling — usually a sign of low refrigerant or airflow problems.
Why this matters for your home
The evaporator coil sits in your air handler or furnace plenum, where cold refrigerant absorbs heat from the air blowing across it. That heat exchange is what actually cools your home, and it's also where humidity condenses out of the air.
When a coil freezes into a block of ice you lose cooling fast — usually from low refrigerant, a dirty filter, or weak airflow. We diagnose the underlying cause rather than just thawing it, because a coil that keeps freezing points to a problem that will return.