Reversing valve failure could be a reason for the cooling problems of the heat pump. This could be detected when you feel hot air pushed out of the indoor unit instead of cold.
High upfront costs
Challenges in sustainability of heat transfer fluids
Challenges with heat pump valve failures
Cooling problems with heat pumps
Leakage of heat pump refrigerants
Noise challenge with heat pump operations
Design challenges for heat pumps
Poor heat pump installation
Challenges in cold temperature operations
Challenges with heat pump operations and performance in cold regions