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DIY Air Source Heat Pump

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What would the efficiency of something like this diy air source heat pump? I know a tame fridge guy who can degas / regas:

 

 

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Efficiency is irrelevant - it would have about 0.5kw output at best so would be pretty pointless unless you were planning on heating a small, well sealed cupboard with it. 

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58 minutes ago, PeterW said:

Efficiency is irrelevant - it would have about 0.5kw output at best so would be pretty pointless unless you were planning on heating a small, well sealed cupboard with it. 

 

 

Or, perhaps, run it in reverse in a small, well-sealed, cupboard.  You could call it a "refrigerator"...  😏

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