What are the advantages and disadvantages of air source heat pump?

The biggest advantage of air source heat pump is energy saving and environmental protection. Although electricity is also needed, electricity only drives the compressor to do work and transfers the heat in the air to water through the physical phase change of refrigerant, so it saves energy by more than 70% compared with direct electric heating. During the whole operation, no pollutants such as waste gas, waste water and waste residue are discharged, which is a real energy-saving and environmental protection equipment. Disadvantages: In the past, the technology was immature, the winter temperature in the northern region was low, and the heating efficiency was low. In recent years, multi-stage cascade enhanced steam injection technology has been used normally at -25℃. If we have to find a shortcoming, it will be a little more expensive than traditional heating equipment.