Is it not simply a temperature thing? Ie its a bit like you ask why nobody
has managed to make a freezer that goes below what we call absolute zero.
the reason is that you need to dump the heat inside somewhere and you can't
do that.
Brian

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"Maurice" wrote in message
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On Sun, 29 Jan 2017 13:22:17 +0000, I wrote:

https://www.whitegoodshelp.co.uk/can...e-feezer-in-a-
garage/

Anyone know when the new refrigerant (the one that needs minimum 10oC
ambient) was first introduced - and why?

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