I am neither fridgie, nor expert, but would not a "closed loop" system just increase humidity as swampies cool by evaporation, thus, increasing humidity. In a humid environment they become less efficient, so, by working in a closed loop, surely they would become less efficient. I do agree with the rationale that shade might make a difference, but have little experience to either confirm or deny that. Over the last few days with our ducted swampie running, there was an approx 16deg difference between inside and outside i.e 44C on the verandah in the shade to 28C in the kitchen.
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