An Air Source Heat Pump (ASHP) is a device that transfers heat from the outside air to heat or cool a building. It works by extracting heat from the air, even in cold temperatures, and using it to warm indoor spaces. In warmer months, the process can be reversed to provide cooling by removing heat from the indoor air. ASHPs are energy-efficient and can significantly reduce energy bills compared to traditional heating systems. They are also environmentally friendly, as they use renewable energy from the air and can help lower greenhouse gas emissions when paired with renewable energy sources like solar or wind power.