It's two parts, the compressor in a box with a big fan on the outside and a box on the wall indoors containing a refrigerant to air heat exchanger and a fan. T

It's two parts, the compressor in a box with a big fan on the outside and a box on the wall indoors containing a refrigerant to air heat exchanger and a fan. The two are connected by pipes, typically three or four metres long, containing the refrigerant. So yes, air-to-refrigerant-to-air. But your packaged terminal heat pump is also air-to-refrigerant-to-air. Both are just refrigerators turned inside out. "“Packaged terminal heat pump” means a packaged terminal air conditioner that utilizes reverse cycle refrigeration as its prime heat source, " [1] [1] https://www1.eere.energy.gov/buildings/appliance_standards/standards.aspx?productid=46&action=viewcurrent https://www1.eere.energy.gov/buildings/appliance_standards/s... Most heat pumps installed in dwellings in Norway are capable of cooling the building as well as heating it. This is the one that will be installed in my house (in Norwegian, Google does a good translation job): https://www.toshibavarmepumper.no/varmepumper-luft-luft/toshiba-polar-25/ https://www.toshibavarmepumper.no/varmepumper-luft-luft/tosh...