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https://scanmont.se/ There are two types of air heat pumps: air-to-air heat pumps and air-to-water heat pumps. Air-to-air heat pumps work by transferring heat from the air outside to the air inside your home. They are most commonly used for space heating and cooling. Air-to-water heat pumps work by transferring heat from the air outside to water that is used for space heating, radiant floor heating, or even swimming pool heating.