They are a new and unknown entity, Armstrong added. “Their effectiveness has yet to be seen when installed en masse.”

Air source heat pumps are also very expensive and there are fewer qualified and experienced installers to do the work.

Installing heat pumps can costs from £10,000 to £30,000, depending on the size on age of your property.

In some cases, your entire heating system might have to be ripped out, including your radiators, with bigger ones required.

Yet the government’s Boiler Upgrade Scheme gives grants of just £6,000 towards a ground source heat pump, or £5,000 towards an air source heat pumps.

This will not be anywhere enough to cover the work in most cases.

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