Record numbers of heat pumps ... have existing loft or cavity wall insulation, which could save around £2,500 in upfront costs, but a well-insulated home can help the heat pump to perform more ...

They are also used to check how existing pipework and heat ... pump is working very efficiently, if all the warmed air leaves the room quickly, you will not get the full benefit of that efficiency ...

But his installer was an engineer who understood how to calculate the heating requirements and design the system, with ...

But his installer was an engineer who understood how to calculate the heating requirements and design the system, with correctly-sized radiators, pipework ... loft insulation we can fit a heat ...