Air Source heat pumps draw air from outside, to heat the water and heating inside the home, and work with external temperatures as low as -15 degrees
If you are off grid and use Oil, Lpg or Electric to currently heat your home, then the payback or reward for installing a heat pump is fantastic. They use electricity only to run the fan that draws the air from outside, and are classed as renewable energy as they are so efficient.
Heat pumps work by drawing in the Air using a fan, and absorbing the heat into a liquid, the fluid then passes through a compressor, and transfers the higher temperature liquid to the heating and hot water system in your home. Its a super efficient way of heating