Kimbro Air
Kimbro Air
HendersonvilleTN 37075
 (615) 824-8098

Why Is My Air Conditioner Freezing Up?

Why Is My Air Conditioner Freezing Up?

If you notice ice on your air conditioner you may be tempted to think that it must be doing a good job of cooling the air in your home. The truth is, a frozen air conditioner can’t cool the air in your home and is a signal that your A/C unit is malfunctioning. So what causes your air conditioner to start freezing up? 

Air Flow Restriction

This is one of the most common causes of a frozen air conditioner, as your unit relies on the flow of air to keep it operating smoothly. It draws warm air from your home into the unit and blows it over the evaporator coils, which hold the refrigerant. The refrigerant inside the coils absorbs the heat from the air and blows the cooled air back into the home. 

If the air flow is restricted, the coolant cannot absorb the heat from the air. The temperature of the coolant drops and can cause your air conditioner to freeze. If your A/C is frozen, check for air flow restrictions first. 

Here are some common things that can cause air flow restriction:

Clogged or dirty filters. The air filter in your air conditioner is designed to remove impurities (like dog hair, dust and dirt) from the air before the air passes through the air conditioner where it is cooled and subsequently recirculated through your home. If the filter is dirty or clogged, your air conditioner will not be able to operate optimally and condensation on the coils may freeze. Change the filter if it is clogged or dirty.

If you have a window unit, check that an object has not accidentally been placed where it will block the air flow to the unit. Furniture, children’s toys or even the drapes can block the vents and interfere with air flow.

Blocked air vents. If you have a window unit, check that an object has not accidentally been placed where it will block the air flow to the unit. Furniture, children’s toys or even the drapes can block the vents and interfere with air flow. If you have central air and have air vents in the ceiling, check that they are not clogged.

Low refrigerant levels. If your air conditioner has a refrigerant leak, you may not be aware of it until your A/C freezes up. Leaks tend to be small and increase over time. They can be caused by vibrations or stress to the unit. If you have a refrigerant leak that causes low levels in the coils, you will need to have your air conditioning unit serviced by a professional.

How to Thaw Out Your Air Conditioner

Regardless of the reason for your frozen air conditioner, you will need to thaw it out before you can use it again. Follow these simple steps to thaw your air conditioner:

  1. Turn off your air conditioner.
  2. Unplug the unit and turn off the main power supply.
  3. Allow the unit to thaw for approximately 24 hours.
  4. Do not try to chip or forcefully remove the ice from the unit, as this can cause damage to the coils.
  5. Use a hair dryer set to the low setting to speed the process (if necessary), but do not apply extreme heat to the unit.
  6. If your problem was poor air flow and you corrected the problem, plug the unit back in and operate it as usual. If air circulation was not the issue, you will need to call your local cooling expert.

Kimbro Air sees these issues every summer, and can find a fix at a cost effective price. Contact us today to schedule an appointment.