3 Quick Ways to Restore a Frozen Air Conditioner

Does the air emitting from your supply registers unexpectedly feel hot? Inspect the indoor portion of your air conditioner. This component is located inside your furnace or air handler, if you rely on a heat pump. If there’s water seeping onto the floor, there may be crystals on the evaporator coil. The AC coil inside the system may have frozen. You’ll need to thaw it before it can cool your home again.

Here’s the steps you should take. If you can’t get the coil frost-free, Service Experts Heating & Air Conditioning is here to assist you with air conditioning repair in Raleigh backed by a 100% satisfaction guarantee.*

Step 1: Turn the Air Conditioning Off and the Blower On

To get started—switch the thermostat from “cool” to “off.” This stops chilled refrigerant from flowing to the outdoor compressor, which could damage it and cause a costly repair.

After that, move the fan from “auto” to “on.” This creates heated airflow over the crystallized coils to help them melt faster. Remember to set the cooling mode to “off” so the air conditioner doesn’t trigger a cooling cycle.

It might take under an hour or the better part of a day for the ice to defrost, depending on the degree of the buildup. While you’re waiting, watch the condensate pan below the AC unit. If the drain line is clogged, it can spill over as the ice melts, likely causing water damage.

Step 2: Diagnose the Trouble

Not enough airflow is a main explanation for an AC to frost over. Here’s how to figure out the problem:

  • Inspect the filter. Insufficient airflow through a dirty filter could be the issue. Check and change the filter once a month or as soon as you notice dust accumulation.
  • Open any sealed supply vents. Your residence’s supply registers should stay open all the time. Closing vents reduces airflow over the evaporator coil, which might lead it to freeze.
  • Look for blocked return vents. These often don’t have shiftable louvers, but furniture, rugs or curtains can still obstruct them.
  • Not enough refrigerant: While airflow restrictions are the most frequent suspect, your air conditioner could also be low on refrigerant. Depending on when it was replaced, it may have Freon® or Puron®. Not enough refrigerant calls for professional support from a certified HVAC technician. H2: Step 3: Contact an HVAC Pro at Service Experts Heating & Air Conditioning

If inadequate airflow doesn’t appear to be the issue, then another issue is leading your AC frost over. If this is the case, just thawing it out won’t fix the problem. The evaporator coil will possibly continually freeze unless you fix the main issue. Call an HVAC tech to look for troubles with your air conditioner, which could include:

  • Refrigerant leak: AC units continuously use refrigerant, so it shouldn’t get used up. Low refrigerant signals a leak somewhere. Only a technician can pinpoint the leak, repair it, and recharge the air conditioning to the appropriate level.
  • Dirty evaporator coil: If dirt builds up on the coil, air can’t reach it, and it’s liable to freeze.
  • Nonfunctional blower: A bad motor or unbalanced fan may prevent airflow over the evaporator coil.

When your AC freezes up, get in touch with the NATE-certified professionals at Service Experts Heating & Air Conditioning to fix the problem. We have lots of experience helping homeowners check their air conditioners, and we’re confident we can get things operating again fast. Contact us at 919-578-4329 to schedule air conditioning repair in Raleigh with us right away.


*Not applicable to the Advantage Program. See your signed Advantage Program agreement for full details and exclusions. 100% Satisfaction Guarantee is subject to certain restrictions and limitations as set forth in the applicable Terms and Conditions.

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