Why Does My AC Freeze Up? — Ice on Coils Explained in Leicester, NC

Professional Why Does My AC Freeze Up? — Ice on Coils Explained in Leicester, NC

When you need why does my ac freeze up? — ice on coils explained in Leicester, NC, Quality Comfort Heating & Cooling is your local HVAC team. Located just 15 minutes west from our Asheville headquarters, we provide fast response times and the same NATE-certified service that Leicester area residents have trusted since 2005.

Leicester is a growing community in western Buncombe County, just minutes from downtown Asheville along NC-63. Quality Comfort provides full HVAC services to Leicester homeowners and businesses — from routine AC and furnace maintenance to emergency heating repair and new system installations. Our proximity means fast response times and same-day service availability throughout the Leicester area.

The Physics of a Frozen AC

Your AC works by expanding refrigerant inside the evaporator coil, which absorbs heat from the air passing over it. When everything works correctly, the coil temperature stays around 35–40°F — cold enough to cool and dehumidify but not cold enough to freeze. When airflow drops or refrigerant is low, the coil temperature drops below 32°F and moisture from Asheville's humid air freezes onto the coil surface. Once ice starts forming, it blocks more airflow, which drops the temperature further, creating a runaway freeze cycle.

Cause #1: Restricted Airflow

Insufficient airflow is the most common reason ACs freeze in Western NC homes. A dirty filter is the usual culprit — when the filter is clogged, not enough warm air passes over the coil to keep it above freezing. Closed or blocked vents, a failing blower motor, a dirty evaporator coil, or collapsed flex duct all reduce airflow with the same result. This is why technicians always ask "when did you last change your filter?" when you report a frozen AC.

Cause #2: Low Refrigerant

When refrigerant is low due to a leak, the remaining refrigerant expands more than designed, making the coil too cold. This is a more serious issue because it means there's a leak somewhere in the sealed refrigerant circuit. Simply adding refrigerant without finding and fixing the leak means the problem will return. A proper repair involves leak detection, repair, evacuation, and recharging to the manufacturer's specification.

What to Do When Your AC Freezes

Turn the system off at the thermostat but set the fan to "on" — this circulates warm room air over the frozen coil to thaw it. Do not chip or scrape ice off the coil, as you can damage the delicate aluminum fins. Thawing takes 2–4 hours depending on how much ice has built up. Replace the filter during this time. Once thawed, restart the system. If it freezes again within a few days, you have a refrigerant issue that requires professional AC repair.