As energy costs continue to fluctuate across the UK, many homeowners are turning to air source heat pumps as a more efficient and low-carbon way to heat their homes. But what exactly are they—and are they worth it? What is an air source heat pump? An air source heat pump (ASHP) extracts heat from the outside air—even in cold temperatures—and uses it to heat your home and hot water. Instead of generating heat like a traditional gas boiler, it moves heat, making it far more ene