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A comment on Homemade Heat Pump Manifesto (2009). Parent comment

Re:Homemade Heat Pump Manifesto (2009) by GordonS on Saturday September 24, 2022 @04:53AM (#32960857)
Plus, don't GSHPs need quite a lot of land for the piping? Houses in the UK are built on the smallest possible plots of land :(

It's normal for temperatures in Scotland to dip below -5C over winter - do ASHPs not work at those temps?

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Re:Homemade Heat Pump Manifesto (2009) by fest on Saturday September 24, 2022 @06:32AM (#32961275)
For horizontal designs yes- the rule of thumb is the brine coil area should be around 3x the heated area. However, the vertical bores don't need much area, just expensive drilling work.
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