Fix Your Frozen Air Conditioner with These 3 Quick Tips

Does the air coming from your supply registers suddenly seem hot? Inspect the indoor part of your air conditioner. This component is situated in your furnace or air handler, if you rely on a heat pump. If there’s water dripping onto the floor, there may be crystals on the evaporator coil. The AC coil in the unit may have frozen over. You’ll need to defrost it before it can cool your home again.

Here’s what to do. If you can’t get the coil defrosted, Service Experts Heating & Air Conditioning is here to help with air conditioning repair in Longmont upheld by a 100% satisfaction guarantee.*

Step 1: Set the Air Conditioning to Off and the Blower On

To begin—switch the thermostat from “cool” to “off.” This prevents chilled refrigerant from moving to the outdoor compressor, which could hurt it and cause a pricey repair.

Then, move the fan from “auto” to “on.” This produces heated airflow over the frosty 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 defrost, depending on the level of the buildup. While you’re waiting, keep an eye on the condensate pan below the AC unit. If the drain line is clogged, it can create a mess as the ice melts, possibly resulting in water damage.

Step 2: Diagnose the Trouble

Not enough airflow is a prime cause for an AC to become frozen. Here’s how to figure out the situation:

  • Exmaine the filter. Low airflow through a dusty filter could be to blame. Look at and put in a new filter monthly or immediately when you observe dust buildup.
  • Open any closed supply vents. Your house’s supply registers should stay open constantly. Shutting vents reduces airflow over the evaporator coil, which might result in it freezing.
  • Check for covered return vents. These typically don’t use moveable louvers, but furniture, rugs or curtains can still block them.
  • Low refrigerant: While airflow restrictions are the most common culprit, your air conditioner might also not have enough refrigerant. Depending on when it was replaced, it may have Freon® or Puron®. Insufficient refrigerant necessitates pro help from a certified HVAC tech. H2: Step 3: Call an HVAC Technician at Service Experts Heating & Air Conditioning

If insufficient airflow doesn’t appear to be the problem, then another issue is causing your AC freeze. If this is what’s happening, merely letting it melt won’t repair the problem. The evaporator coil will possibly keep freezing unless you fix the underlying problem. Get in touch with an HVAC specialist to look for problems with your air conditioner, which can include:

  • Refrigerant leak: AC units continuously use refrigerant, so it shouldn’t run out. Not enough refrigerant is a sign of a leak somewhere. Only a pro can pinpoint the leak, repair it, and recharge the air conditioning to the appropriate level.
  • Grimy evaporator coil: If dust collects on the coil, air can’t get to it, and it’s likely to freeze.
  • Broken blower: A defective motor or unbalanced fan might halt airflow over the evaporator coil.

The next time your AC freezes up, call on the NATE-certified technicians at Service Experts Heating & Air Conditioning to take care of the trouble. We have years of experience helping homeowners diagnose their air conditioners, and we’re sure we can get things operating again fast. Contact us at 303-647-5749 to schedule air conditioning repair in Longmont 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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