AC is Frozen – How Long it Takes to Defrost

June 18, 2025

AC is Frozen – here is how long it takes to defrost 

When the temperature starts rising outside, the last thing you want is for your AC unit to freeze up. Not only is it frustrating, but it can also lead to significant damages to your unit. If your air conditioner has frozen, you may be wondering how long it will take to defrost. Let's take a closer look at the defrosting process and how long it typically takes. 


What Causes an AC to Freeze? 

There are several reasons why an AC unit can freeze up. One common reason is a lack of airflow, which can be caused by dirty air filters or blocked vents. Another possible cause is low refrigerant levels, which can lead to a drop in pressure and a subsequent drop in temperature. Faulty thermostats, clogged evaporator coils, and malfunctioning blower fans can also contribute to a frozen AC unit. 


How Long Does it Take to Defrost an AC? 

The time it takes for an AC to defrost depends on several factors, such as the extent of the freeze and the size of your unit. Typically, it takes between 4 to 6 hours to defrost an AC unit completely. However, this can vary based on the severity of the freeze and how long it has been frozen. 


How to Defrost an AC Unit 

To defrost your AC unit, you can try the following steps: 

  1. Turn off the AC: The first step in defrosting an AC unit is to turn off the power. This will prevent further damage to the unit and ensure safety. 
  2. Check the air filters and vents: Dirty air filters and blocked vents can cause airflow issues that lead to freezing. Check your filters and vents and clean or replace them as necessary. 
  3. Check the refrigerant levels: If the refrigerant levels are low, this can cause freezing. Check the levels and add more refrigerant if necessary. 
  4. Let the unit thaw: After you have addressed any potential issues, let the unit thaw for several hours. You can use a hairdryer on a low setting to speed up the process. 
  5. Turn the unit back on: Once the unit is completely thawed, turn it back on and monitor it to ensure it is functioning properly. 


When to Call a Professional 

If your AC unit continues to freeze up despite your best efforts to address the issue, it may be time to call a professional. A qualified HVAC technician can diagnose the underlying issue and provide a long-term solution to prevent future freezing. 


Conclusion 

A frozen AC unit can be a frustrating and costly issue, but with the right steps, you can defrost your unit and prevent further damage. If you are unsure how to defrost your unit or suspect a more serious issue, contact a professional HVAC technician for assistance. At Fry Heating & Cooling, we are committed to keeping your AC unit functioning properly all summer long. Contact us today for all your AC repair and maintenance needs. 

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