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  • Also considering an air-air heat pump. Something like energybulbs.co.uk/kfr-23iw%2f­x1c+air+conditioning+unit+(wall+split+sy­stem)/1385635130. It seems cheap and likely to do what we need...

    That link is to energy saving lightbulbs!

    Off the top of my head: loft conversions can get quite warm when it's a sunny day. An air-air heat pump could help in keeping it cool when needed as well as heating (if I've understood correctly and an air-air heat pump is the same as a heat exchanger).

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