3 Fast Steps for Fixing a Frozen Air Conditioner

Does the air emitting from your supply registers unexpectedly seem not cold enough? Check the indoor portion of your air conditioner. This component is located in your furnace or air handler, if you rely on a heat pump. If there’s water dripping onto the floor, there could be ice on the evaporator coil. The AC coil in the system might have frosted over. You’ll need to defrost it before it can cool your house again.

Here’s what to do. If you can’t get the coil defrosted, San Antonio Air Service Experts is here to assist you with air conditioning repair in San Antonio backed by a 100% satisfaction guarantee.*

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

First things first—switch the thermostat from “cool” to “off.” This stops chilly refrigerant from moving to the outdoor compressor, which could damage it and cause an expensive repair.

Then, switch the fan from “auto” to “on.” This produces warm airflow over the frozen coils to make them defrost faster. Remember to set the cooling mode to “off” so the air conditioner doesn’t start a cooling cycle.

It can take less than an hour or the majority of the day for the ice to thaw, depending on the degree of the buildup. While you’re waiting, keep an eye on the condensate pan under the AC unit. If the drain line is clogged, it can spill over as the ice melts, possibly resulting in water damage.

Step 2: Diagnose the Situation

Low airflow is a main explanation for an AC to frost over. Here’s how to figure out the situation:

  • Look at the filter. Low airflow through a clogged filter could be to blame. Inspect and put in a new filter each month or once you see dust buildup.
  • Open any closed supply vents. Your house’s supply registers should stay open all the time. Closing vents reduces airflow over the evaporator coil, which could result in it freezing.
  • Check for blocked return vents. These often don’t come with moveable louvers, but furniture, rugs or curtains can still obstruct them.
  • Low refrigerant: While airflow restrictions are the most frequent cause, your air conditioning might also not have enough refrigerant. Depending on when it was installed, it may have Freon® or Puron®. Insufficient refrigerant requires professional assistance from a certified HVAC tech. H2: Step 3: Call an HVAC Professional at San Antonio Air Service Experts

If inadequate airflow doesn’t seem to be the trouble, then something else is leading your AC freeze up. If this is what’s going on, just defrosting it won’t repair the issue. The evaporator coil is likely to freeze again unless you take care of the underlying problem. Get in touch with an HVAC pro to address problems with your air conditioner, which might include:

  • Refrigerant leak: AC units continuously use refrigerant, so it shouldn’t run out. Low refrigerant signals a leak somewhere. Only a professional can find the leak, mend it, and recharge the air conditioner to the correct amount.
  • Dirty evaporator coil: If grime builds up on the coil, air can’t reach it, and it’s likely to freeze.
  • Nonfunctional blower: A defective motor or unbalanced fan might prevent airflow over the evaporator coil.

The next time your AC freezes up, get in touch with the NATE-certified professionals at San Antonio Air Service Experts to repair the situation. We have a lot of experience helping homeowners check their air conditioners, and we’re certain we can get things running again fast. Contact us at 210-570-9705 to get air conditioning repair in San Antonio with us now.


*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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