Like the ground source pumps, Air source heat pumps create a transfer of external heat differential to warm up interiors within homes.

The pumps are installed to the outside of the property and absorb heat from the outside air. This heat can then be used to warm water for radiators or under-floor heating systems, or to warm the air in your home. The two main system types are air to water systems and air to air systems. Air Source pumps can be an alternative where site conditions restrict the use of ground source systems. Again, the initial outlay is more expensive than a conventional gas system, but as with ground source systems, the energy source is free and the running cost reduced to a fraction of gas fired systems. Its success very much depends on how well a home is insulated but, once the insulation and pump is properly installed, the carbon reductions are dramatic.

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