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That’s not in a desert though.

the link is about humidifiers, not dehumidifiers

https://blog.constellation.com/2018/09/21/energy-efficient-d... gives a ballpark number:

"In order to be approved by ENERGY STAR®️, energy-efficient dehumidifiers must have an energy factor of at least 2.00, or an energy factor greater than 2.80 for dehumidifiers that remove more than 75 pints of moisture a day."

So 2-3 litres water extracted per kWh electricity consumed (And I'm guessing this is probably in best case damp conditions).

Is that with all the windows closed?