Fast Steps for Fixing a Frozen Air Conditioner

Does the air flowing from your supply registers abruptly feel hot? Check the indoor portion of your air conditioner. This part is located within your furnace or air handler, if you rely on a heat pump. If there’s water seeping onto the floor, there could be ice on the evaporator coil. The AC coil within the unit may have frozen. You’ll need to defrost it before it can cool your house again. 

Here’s the things you should do. If you can’t get the coil defrosted, Service Experts Heating, Air Conditioning & Plumbing is here to help with air conditioning repair in the U.S. that includes a 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 prevents chilled refrigerant from moving to the outdoor compressor, which could hurt it and lead to a costly repair. 

Then, adjust the fan from “auto” to “on.” This produces hot airflow over the frozen coils to make them melt faster. Double check to set the cooling mode to “off” so the air conditioner doesn’t start a cooling cycle. 

It can take under an hour or the better part of a day for the ice to defrost, depending on the extent of the buildup. While you’re waiting, keep an eye on the condensate pan underneath the AC unit. If the drain line is obstructed, it might overflow as the ice melts, possibly causing water damage. 

Step 2: Diagnose the Situation 

Low airflow is a primary explanation for an AC to freeze up. Here’s how to figure out the problem: 

  • Inspect the filter. Insufficient airflow through a filthy filter could be the culprit. Inspect and replace the filter monthly or as soon as you notice a layer of dust. 
  • Open any shut supply vents. Your house’s supply registers should be open all the time. Closing vents limits airflow over the evaporator coil, which might result in it freezing. 
  • Be on the lookout for obstructed return vents. These typically don’t use moveable louvers, but furniture, rugs or curtains can still cover them. 
  • Low refrigerant: While airflow restrictions are the most common suspect, your system could also have insufficient refrigerant. Depending on when it was installed, it may rely on Freon®. Not enough refrigerant calls for pro attention from a certified HVAC tech. H2: Step 3: Call an HVAC Tech at Service Experts Heating, Air Conditioning & Plumbing 

If poor airflow doesn’t feel like the issue, then another problem is leading your AC freeze. If this is what’s happening, simply thawing it out won’t repair the trouble. The evaporator coil is likely to freeze again unless you fix the underlying cause. Call an HVAC pro to check for issues with your air conditioner, which might include: 

  • Refrigerant leak: AC units keep using refrigerant, so it shouldn’t run out. Not enough refrigerant signals a leak somewhere. Only a specialist can find the leak, mend it, and recharge the air conditioner to the correct level. 
  • Filthy evaporator coil: If grime collects on the coil, air can’t reach it, and it’s likely to freeze. 
  • Nonfunctional blower: A bad motor or unbalanced fan can halt airflow over the evaporator coil. 

The next time your AC freezes up, contact the ACE-certified techs at Service Experts Heating, Air Conditioning & Plumbing to fix the situation. We have years of experience helping homeowners troubleshoot their air conditioners, and we’re sure we can get things running again in no time. Contact us at 866-397-3787 to schedule air conditioning repair in the U.S. with us right away. 

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