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Internal air-source heat-pump unit

(Click to enlarge photo)

Here is the inside unit corresponding to the air-source heat-pump outside. Again it is an arrangement of fins on pipes with a fan to blow air over them however, the compressor for the refrigerant is only in the outside unit. Oh yes, that's another drawback, because the outdoor unit has to be quite close to where the heat or cooling is going, the noise of the compressor cutting in and out might annoy some people. Personally, it doesn't bother me at all. I installed this system in 2006 and since then it has been easy to use and very reliable. It produces around 6kW of heat for 2kW of electricity. It is very useful in spring and autumn to lift the temperature of the house when it is not worth starting the central-heating.