Several websites which I have looked at state that refrigerant coolers can't be used if the ambient temp. is below 21C. What's the reason for this? I'd like to use one of the 'through-wall' or 'split' systems for a Coldroom. Do any UK retailers supply the US 'KoolSpace' or 'WhisperKool' units which seem designed for this purpose? I haven't found any via Google.
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