heat pump icing up

14February 2023

heat pump icing up

Heat pumps are a popular HVAC choice for many homeowners due to their energy efficiency and versatility, what to do when a heat pump icing up happens

This can cause a range of problems, from decreased energy efficiency to system failure. In this blog post, we’ll explore the reasons why heat pumps can ice up and what you can do to prevent this issue.

Reasons for Heat Pump Icing Up

  1. Low Outdoor Temperatures: One of the most common causes of heat pump icing up is low outdoor temperatures. When the temperature drops below freezing, the heat pump can start to collect ice on the coils and other components.
  2. Blocked Airflow: If there is a blockage in the airflow to the heat pump, this can cause the coils to freeze and ice up. Common causes of airflow blockages include dirty air filters, clogged ducts, or a faulty fan motor.
  3. Refrigerant Leaks: Refrigerant leaks can cause the heat pump to run inefficiently and overheat, leading to icing up. Leaks can be caused by a variety of factors, including corrosion, cracks in refrigerant lines, or improper installation.
  4. Defective Defrost Control: The defrost control is responsible for switching the heat pump from cooling to heating mode and vice versa. If the defrost control is defective, the heat pump may not defrost properly, leading to icing up.

Preventing Heat Pump Icing Up

  1. Regular Maintenance: Regular maintenance is the best way to prevent the heat pump from icing up. During maintenance, a professional HVAC technician will check for and address any issues that could be causing icing up, such as dirty air filters, clogged ducts, or refrigerant leaks.
  2. Insulate the Heat Pump: Insulating the heat pump can help to prevent icing up by reducing heat loss and keeping the system running efficiently.
  3. Clear Debris: Clearing debris from around the heat pump can help to improve airflow and reduce the risk of icing up.
  4. Check the Refrigerant: If you suspect a refrigerant leak, it’s important to have a professional HVAC technician check and repair the leak as soon as possible to prevent icing up.


Heat pump icing up can be a frustrating and costly issue, but it can be prevented with regular maintenance and a few simple steps.

By keeping your heat pump in good condition and addressing any issues that may arise, you can ensure that your system runs smoothly and efficiently for years to come.

If you’re experiencing problems with your heat pump icing up, it’s important to seek help from a professional HVAC technician.

They will be able to diagnose the issue and provide a solution to keep your heat pump running smoothly.