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  1. Ferdinand
    Can anyone give me a quick summary, or link, as to the minimum practical external temperature for A2A heat pump installs to function? Background is that I am currently using GFCH underfloor downstairs / rads upstairs, and I have been experimenting with a portable A2A heat pump heater / cooler for about 18 months in the kitchen diner. I am satisfied that it puts off any need for GFCH use by a few weeks either end, a boost to the house via air flow, and gives me a nice cooling facility in high summer. But my unit says it is not practical below 7C external temperature. Were I to look to install A2A units as an eventual replacement for the GFCH would that limit be about the same ie not much use below 7C? Hence my question. Thanks in advance for any replies.
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