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Air Sourced Heat Pump.

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A person today that I was talking to, that has had a new build home which was required by building regs. to have an air sourced heat pump for heating and hot water, complained that the system was slow to heat or cool as required. He said that he had to have underfloor heating installed. It was slow to warm the rooms on cold days. He recently had the system set to cool the rooms on the very hot recent days. But this morning was cooler and he required heating. Is this normal?


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    Sorry Andy, you need to study some thermodynamics, that may be a claim, and it may be true for a ground source system where the ground temperature (or the nearest river or lake), is not anywhere below zero, and the output water temperature is perhaps 30 degrees, which needs huge radiators (actually convectors, but don't bother telling the world). This is the worst understood area of physics, closely followed by Electrical Engineering! Air source pumps are really a fairly bad idea, because the air temperature varies far too much to optimise the system properly, so the COP varies widely, from perhaps a low of 2 to 10 maximum where you only need a small heat output from fairly warm weather.
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    Sorry Andy, you need to study some thermodynamics, that may be a claim, and it may be true for a ground source system where the ground temperature (or the nearest river or lake), is not anywhere below zero, and the output water temperature is perhaps 30 degrees, which needs huge radiators (actually convectors, but don't bother telling the world). This is the worst understood area of physics, closely followed by Electrical Engineering! Air source pumps are really a fairly bad idea, because the air temperature varies far too much to optimise the system properly, so the COP varies widely, from perhaps a low of 2 to 10 maximum where you only need a small heat output from fairly warm weather.
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