AC Frozen Coil

Professional AC Frozen Coil in Asheville & Western NC

Seeing ice buildup on your air conditioner's refrigerant lines or evaporator coil is a clear sign something is wrong with airflow or refrigerant levels.

What Causes an AC Coil to Freeze

Your evaporator coil absorbs heat from the air passing over it. When airflow is restricted or refrigerant is low, the coil temperature drops below freezing and moisture in the air freezes on contact. The ice insulates the coil further, making the problem worse until cooling stops entirely. Common causes include a dirty air filter severely restricting airflow, a blower motor running too slowly, low refrigerant from a leak, closed or blocked supply vents, or a dirty evaporator coil.

Quick Things You Can Check

If you see ice, turn the system to 'fan only' to let it thaw — this runs warm air over the coil without running the compressor. Never scrape ice off the coil, as you can damage the fins and tubing. Replace the air filter and open all supply vents. Let the system thaw completely (2-4 hours) before restarting in cooling mode.

When This Becomes a Serious Problem

Running the compressor with a frozen coil can cause liquid slugging — liquid refrigerant returning to the compressor — which can destroy the compressor entirely. If the coil keeps freezing after you've replaced the filter, you likely have a refrigerant leak. A frozen coil will also cause water leaking as the ice thaws, and the AC won't cool your home until the underlying cause is fixed.

When to Call for AC Repair in Asheville

If the coil freezes again after thawing and a filter change, you need professional diagnosis. Quality Comfort provides same-day AC repair in Asheville — we check refrigerant levels, test for leaks, inspect the blower motor, and fix the root cause so the coil stays clear.