Repair guide
Why Is My AC Freezing Up? Causes and Fixes for NYC Homes
Why an air conditioner ices over, what to do right away, and when a technician is needed in New York City homes and apartments. Key points in this guide: Restricted airflow is the most common cause; Low refrigerant from a leak also causes icing; Turn cooling off and run the fan to thaw the coil.
Quick answer
An air conditioner freezes up when the evaporator coil gets too cold to shed moisture, and the most common causes are restricted airflow and low refrigerant. A dirty filter, blocked return, closed vents or a failing blower motor limit airflow, while a refrigerant leak drops pressure and temperature below freezing. If you see ice, turn the cooling off and run only the fan so the ice melts, which can take several hours. Do not chip the ice. Gotham Home Services diagnoses frozen systems in Manhattan, Brooklyn, Queens and Long Island, repairs the cause rather than just thawing the coil, and provides a written quote before approved work.
Published · Updated
A frozen air conditioner is a symptom, not the problem itself, and it usually returns until the cause is found. For repair across the city, see AC and HVAC repair in NYC.
Key points
- 1.Restricted airflow is the most common cause
- 2.Low refrigerant from a leak also causes icing
- 3.Turn cooling off and run the fan to thaw the coil
- 4.Never chip ice off the coil
- 5.Thawing alone does not fix the cause
- 6.A technician should check refrigerant and the blower
In more detail
Check the simple things first. Replace a dirty filter, make sure supply vents and returns are open and unblocked, and confirm the thermostat is not set unusually low. Then switch the system from cool to fan only so warm air can melt the ice. Wait until the coil is fully clear before restarting.
If it freezes again, the cause is probably inside the system: a weak blower motor, a dirty evaporator coil or a refrigerant leak. Refrigerant is not used up, so low charge means a leak that needs finding and repairing. A related symptom is the unit running but not cooling, covered in why an AC is not cooling.
Water from melting ice can also overflow the drain pan. If you see leaks, read what causes water leaks from a ductless unit, since the drainage causes overlap.
FAQ
Frequently asked questions
What is the short answer on why Is My AC Freezing Up?
An air conditioner freezes up when the evaporator coil gets too cold to shed moisture, and the most common causes are restricted airflow and low refrigerant. A dirty filter, blocked return, closed vents or a failing blower motor limit airflow, while a refrigerant leak drops pressure and temperature below freezing.
What are the key points to remember?
Restricted airflow is the most common cause. Low refrigerant from a leak also causes icing. Turn cooling off and run the fan to thaw the coil. Never chip ice off the coil. Thawing alone does not fix the cause. A technician should check refrigerant and the blower.
Does Gotham Home Services serve my area?
Yes. Gotham Home Services serves Manhattan, Brooklyn, Queens, the Bronx, Staten Island and Long Island.
How do I get a quote?
Call (516) 348-5145 or request a quote online. A technician diagnoses the problem on site and gives a written quote before any approved work begins.