What is the major problem of heat pump?

The major problem of heat pumps is that they are not very efficient in cold climates. Heat pumps rely on the transfer of heat from the outside air to the inside of the home, but when the outside air is too cold, the heat pump has to work harder to transfer the heat, resulting in higher energy costs. Additionally, heat pumps can be prone to icing up in cold climates, which can cause the system to malfunction and require costly repairs.