How to Fix AC Freezing Up
A frozen air conditioner can't cool your home and may damage the compressor. Learn the common causes of AC freeze-ups and how to safely thaw and prevent future freezing.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Turn Off AC Immediately
Step 1: Turn Off AC Immediately
Shut off the air conditioner at the thermostat and circuit breaker. Running a frozen AC can damage the compressor.
HVAC Thermometer
Digital thermometer for AC diagnostics
2 Step 2: Allow Ice to Thaw
Step 2: Allow Ice to Thaw
Turn on the fan-only mode to circulate air and speed thawing. Place towels under the unit to catch water. Full thawing takes 1-24 hours.
Coil Cleaner Spray
Foaming cleaner for evaporator coils
3 Step 3: Check and Replace Filter
Step 3: Check and Replace Filter
A dirty filter is the most common cause. Replace with a clean filter and ensure vents aren't blocked by furniture.
AC Filter 16x25
Pleated air filter for improved airflow
4 Step 4: Inspect Indoor Coils
Step 4: Inspect Indoor Coils
Dirty evaporator coils restrict airflow. If accessible, gently clean with a soft brush. Professional cleaning may be needed for thorough cleaning.
AC Refrigerant Gauge
Manifold gauge for checking refrigerant levels
5 Step 5: Verify Proper Airflow
Step 5: Verify Proper Airflow
Ensure all supply vents are open and registers aren't blocked. Close no more than 20% of vents to maintain proper system pressure.
Condensate Pump
Replacement pump for AC drain line
6 Step 6: Call HVAC Professional if Problem Persists
Step 6: Call HVAC Professional if Problem Persists
Recurring freezing may indicate low refrigerant, blower motor issues, or refrigerant leak requiring professional diagnosis and repair.
Drain Line Tablets
Algae prevention tablets for drain lines