By no means an expert, I can share my conclusions from reading a fair amount recently:
1. For cold climates, CO2 refrigerant. This has meant Japanese brands for the most part, but I think some German also. I presume Chinese copycat brands will reach the market sooner or later.
2. Proper maintenance, design and installation that avoids ice build-up is KEY to avoiding early failure.
(2) is actually why I hesitate, because my local AC people do not know these units yet. So you either learn enough to do it right yourself or I suggest you avoid these units for now
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