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How to Fix a Frozen Air Conditioner

February 23, 2015

Summer’s coming (we promise) and here's an often cited scenario with the average homeowner: They’re sitting in their house, minding their own business, happily indulging a bowl of popcorn and watching Netflix, when suddenly he/she hears 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 sinking feeling. How did the leak start?; water heater, leaky toilet, shower, faucet? Not necessarily – it's the air conditioner of all things. This can occur anywhere, from Oakville to Africa, regardless of summer heat.

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Why Air Conditioners Freeze

When a central air conditioner freezes up, what actually freezes is the condenser unit's evaporator coil. This component of the air conditioner transfers (evaporates) heat from the inside to the outside of your Oakville area home. The two main reasons why the evaporator coil may freeze:

  1. Airflow restriction
  2. Lack of sufficient refrigerant

Either way, the result is that the air conditioner's evaporator coil cannot operate to properly dissipate 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. In other words, 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. Just make sure the A/C system is completely OFF.
  2. Check to ensure that the airflow around your system is unrestricted. 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 impeded by furniture or curtains.
  3. Call Abbey Air Service Experts. The air conditioning system needs to be serviced by a professional that is NATE-certified 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 lead to a costly repair. When your unit freezes over it can lead to damage to the compressor. Replacing your compressor can cost as much as a downpayment on a brand new air conditioner. In fact, many people are forced to choose between installing a new system and repairing the damaged model. If you move fast, follow the instructions, and call a NATE-certified technician, you have better odds 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 is present (and that is rare, but possible), the leak has to be repaired or the unit will probably freeze again.
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