Air source heat pumps can be a really efficient way to generate heat. Although they require electricity to run, they generate much more heat than an electric heater that uses the same amount.
Air source heat pumps provide heat at a lower temperature than most other types of space heating. This means they’re most efficient when they’re left on for longer periods of time, and distribute heat through wet heating systems with large surface areas, like underfloor heating or big radiators.
Air source heat pumps can be much more efficient than oil and LPG boilers, and older electric heating systems. However, they’re only usually the most efficient option if your property is very well insulated.