Ice Cold: What to do if Your HVAC is Freezing Up

It's good to have your HVAC blow cold air, but not so good if your AC unit freezes up. Here's what to do to solve this common issue.

Summer is coming, and so is that hot sticky weather. Time to turn on your air conditioner. Americans spend about $29 billion on air conditioning costs to keep cool in the hot months.

It’s good to have your HVAC blow cold air, but not so good if your AC unit freezes up. Here’s what to do to solve this common issue.

Unthaw Your Air Conditioner

If there is ice on your air conditioner, you need to thaw it first. Be sure to turn off your air conditioner off and the electrical breaker. You will probably need a full day to let it thaw completely.

You can also turn off the system and keep the blower running. Don’t run your air conditioner if the evaporator coil is frozen because it can wear out your compressor and damage the unit. Also, do not remove the ice yourself by chipping away because that can also be harmful to the components.

Check Your Evaporator Coil

dirty evaporator coil restricts airflow and drops the temperature, freezing your unit. Turn off the AC at your thermostat. Turn the switch to fan only to blow warm air over the coils. 

Don’t let dust and dirt build up outside the evaporator coils, that transfer the refrigerant to the unit’s heat pump. The coils need to be cleaned occasionally so they can absorb heat properly.

Check the AC’s air filter

One of the most common causes of air conditioner issues is restricted airflow through filters. You should change your air filter at least every 2 to 3 months to keep it clean. 

If the filter is clogged, the air flow will cause the system’s temperature to drop and freeze up your unit. Before calling a professional, be sure you check your air filter for any clogs.

Look for Refrigerant Leak

You need refrigerant to keep your home cool, and sometimes those lines can leak. This can also cause your AC to freeze. A freon leak can also expose you to harmful effects of the refrigerant, so check the lines for any dripping or puddles. 

Examine Ductwork 

Clogs in your ductwork can also cause airflow restriction. Open all your registers, including those on your ceiling, and look inside the registers for any buildups. High-quality filters should limit debris in your ductwork.  

AC Unit Freezes Up Final Thoughts

You can take small steps to maintain your AC unit and keep it running smoothly. Make sure you:

  • Clean or change air filters regularly to prevent clogs
  • Check coolant levels to find a refrigerant leak
  • Clean your evaporator coils to prevent blocked registers
  • Schedule professional tune-ups to ensure your system is functioning efficiently

If you tried all these steps and your AC unit freezes up again, it’s time to call a professional to help prevent any further damage to your unit. It could also be a mechanical issue, which needs to be repaired by a professional.

Contact On Point Service Company today for an honest estimate or even a free second open. We are here to help you keep your cool.


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