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Why Is My Air Conditioner Freezing?

Even in warm weather, your air conditioner can freeze up. And usually, it’s a sign of a bigger problem. Learn more below about why your air conditioner might be freezing.
  • Restricted Air Flow: A dirty air filter, blocked air ducts, a malfunctioning fan, or anything else that restricts air flow will cause the temperature of your system’s evaporator coil to fall below freezing. Condensation will then collect on the coil, causing ice to form.
  • Refrigeration Problems:  Low or leaking refrigerant can cause pressure drops in the air conditioner’s evaporator coil, which will allow accumulating condensation to freeze on it.
  • Outdoor Temperature: Most air conditioning systems are not designed to work in in temperatures below 60 degrees F. Running your system in low nighttime temperatures will cause its pressure to drop, potentially leading to a freeze-up.
  • Improperly tilted window unit: A window unit with an improper tilt (the indoor half should be slightly higher than the outdoor half) prevents water from properly exiting the drain hole. The lingering water stays inside the unit where it can freeze.
You can avoid these problems with your air conditioning system by scheduling regular preventative maintenance. Call an ARS®/Rescue Rooter® Comfort Advisor at 1-800-277-9400 to schedule an appointment
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