Air-source heat pumps are devices that transfer heat between the air outside and the air inside a building. They work by extracting heat from the outside air, even in cold temperatures, and using it to warm the indoor space. In warmer months, they can reverse the process to cool the building by removing heat from the indoor air. These systems are energy-efficient and can reduce heating and cooling costs compared to traditional systems. They are often used in residential and commercial settings and can be integrated with existing heating systems. Energy efficiency, residential heating, and cooling systems are key benefits of air-source heat pumps.