Coolerado H80

Coolerado’s rooftop air conditioner handles dry weather more than twice as efficiently as anything else, cutting energy consumption in the hottest, most AC-dependent desert areas. It improves the specific type of unit used in arid regions, which pulls heat out of the air when water inside the unit evaporates (much as sweat cools you down as it evaporates). The system also cools the air around the water, creating a bigger temperature difference so it can absorb more heat from the outside air. When it rains, a traditional compressor kicks in to cut moisture.
From $10,000; coolerado.com