Prevent Frozen Evaporator Coils in AC

Air Conditioners

As a homeowner, encountering an issue with your air conditioner can be quite frustrating, especially during the sweltering summer months. One of the most common air conditioner issues is frozen evaporator coils. Here, we will explore what evaporator coils are, the reasons behind their freezing, and how to prevent this issue from occurring in the first place. If you’re currently facing a problem, reach out to ALP Heating for expert assistance.

What are Evaporator Coils?

Evaporator coils are essential components of an air conditioning system. They are responsible for absorbing heat from your indoor air and transferring it outside, thus cooling the air that circulates throughout your home. The evaporator coils are typically located within the indoor unit of your air conditioner and are connected to the refrigerant lines.

Why Do Evaporator Coils Freeze?

There are several reasons why evaporator coils may freeze. Some of the most common factors include:

  • Insufficient Airflow: A decrease in airflow can result in insufficient heat transfer, causing the coils to freeze. The reduced airflow might be due to a clogged air filter, blocked vents, or a malfunctioning blower motor.
  • Low Refrigerant Levels: A refrigerant leak or low refrigerant levels can also lead to frozen evaporator coils. When the refrigerant is low, the pressure in the system drops, causing the temperature of the evaporator coil to fall below freezing.
  • Dirty Coils: Over time, dust and debris can accumulate on the evaporator coils, reducing their efficiency and leading to freezing.
  • Mechanical Issues: Malfunctions in the air conditioner’s components, such as a faulty expansion valve or a damaged blower motor, can contribute to the freezing of evaporator coils.
  • Thermostat issues: If your thermostat is set too low or is malfunctioning, it may cause the air conditioner to run continuously, leading to frozen coils.

How to Prevent Frozen Evaporator Coils?

To prevent frozen evaporator coils in air conditioner, consider the following tips:

  • Regularly Change Air Filters: Replace your air filters every 1-3 months, depending on the type of filter and your specific needs. This will ensure proper airflow and prevent dirt and debris from accumulating on the coils.
  • Schedule Routine Maintenance: Regular maintenance by a professional HVAC technician such as ALP Heating can help detect potential issues before they become severe. This includes checking refrigerant levels, cleaning the coils, and inspecting other components for wear and tear.
  • Keep Vents Clear: Make sure there is no furniture or other objects obstructing the airflow through your vents. Blocked vents can lead to reduced airflow and eventually freezing of the evaporator coils. ALP Heating Ltd. can perform a thorough inspection of your ductwork to ensure optimal airflow.
  • Monitor Refrigerant Levels: Periodically check the refrigerant levels in your air conditioning system. Aim for a comfortable temperature that maintains energy efficiency. If you suspect a leak, contact a professional HVAC technician for assistance.
  • Install a safety switch: ALP Heating Ltd. can install a safety switch that automatically turns off your air conditioner if the evaporator coil temperature drops too low, preventing freezing and potential damage to the system.


Frozen evaporator coils are a common air conditioner issue that can impact the efficiency and comfort of your home. By understanding the reasons behind the freezing and taking preventative measures, you can avoid this problem and ensure your air conditioner operates smoothly.

If you’re currently experiencing issues and need air conditioner repair services, don’t hesitate to contact ALP Heating at 647-972-8714 or via email at [email protected]. Our team of experts is here to help resolve any problems and ensure your home stays cool and comfortable.

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