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The Eco-Cool Operating Temp. Range 33°F to 110°F (2°C to 43°C) isn't impressive for us desert dwellers.  I see that with many mini splits also.

Hmm good catch, but as you say there is not much that does well once you are past that temp on the high side. The low side you should have another source of heat from your aqua hot. Good to know though, for those that want to bake it out in the desert.