For optimal efficiency, where should the air-to-air heat pump outdoor unit be located?

The outdoor unit of an air-to-air heat pump should ideally be located in a moderate climate zone to achieve optimal efficiency. In moderate climates, the temperature range allows the heat pump to operate effectively without excessive strain. This zone typically experiences temperatures that are not too cold, which helps maintain the system's ability to extract heat from the outdoor air, while avoiding the extreme heat conditions that can hinder performance efficiency.

Additionally, moderate climates provide a balanced environment that reduces the likelihood of the heat pump having to work harder due to extreme cold or heat. In contrast, locations characterized by high humidity may result in issues with moisture and frost, and extremely cold climates can impede the heat pump’s ability to absorb heat from the air. Therefore, positioning the unit in a moderate climate zone ensures the combination of less operational stress and greater energy efficiency throughout the heating or cooling phases.