How to Fix a Frozen Air Conditioner

February 23, 2015

Summer’s coming (we promise) and here's a typical scenario with the average homeowner: They’re relaxing in their living room, minding their own business, having a bowl of popcorn and watching their favorite TV show, when all of a sudden – that distant awful sound; drip... drip... drip. They glance over to see the household pet licking at a puddle that's steadily forming on the bathroom floor. In a flash: Concern, stress, and that ”oh brother!” feeling. Where did the leak come from?; water heater, leaky toilet, shower, faucet? Nope – it's the air conditioner of all things. This can strike anywhere, from Buffalo to Timbuktu, regardless of summer heat.

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Why Air Conditioners Freeze

The evaporator coil is the component of a central A/C unit that actually freezes. This component of the air conditioner transfers (evaporates) heat from the inside to the outside of your Buffalo area home. There are two primary reasons the evaporator coil may freeze:

  1. Airflow restriction
  2. Insufficient refrigerant

Either way, the result is that the air conditioner's evaporator coil will be unable to properly disperse the heat, and consequently 'overcools' itself. The impact of this super-cooling is condensation (that's water formation), and over time ice forms from that condensation as it cools below the freezing point. Yep, the A/C has morphed into an old-school icebox.

What Should You Do When Your A/C Freezes?

  1. Turn the A/C completely off at the thermostat, and do not increase the thermostat temperature as a way to melt the frost on the coils. It is important that the A/C system is completely OFF.
  2. Do what you can to ensure airflow is not restricted. Replace the furnace or air handler's filter as well as any return air filters. Open all the registers completely and confirm that they are not obstructed by furniture or curtains.
  3. Call Sunbeam Service Experts Heating & Air Conditioning. The air conditioning system needs to be professionally inspected to ensure there are no refrigerant leaks or damage to the equipment. Simply schedule a Performance Inspection or Repair Diagnostic online, or call to talk to a live person right away.

What Does it Cost to Repair?

This can turn into a pricey repair. When your unit ices over it can lead to damage to the compressor. Replacing your compressor can cost as much as a downpayment on a new system. In fact, many homeowners are forced to pick between installing a new system and repairing the old unit. If you move fast, follow the instructions, and call a NATE-certified technician, you stand a better chance of having a less expensive emergency.

Your technician will advise you of the exact cause and how to avoid the issue from repeating in the future. If a leak was really the cause (and that is rare, but possible), the leak has to be repaired or the unit will likely freeze again.
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