dealscool-a-zone 900 sf portable evaporative cooling…

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I know that a "swamp cooler" becomes less effective as humidity rises.

I just read the unit's manual (it is on the website) and cooling vs. humidity is not addressed at all.

Does anyone know how well these (or other swamp coolers) work in fairly high humidity, say 70% or above?

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I highly suggest you contact the manufacturer - the information listed on the website is probably all they have: 888.827.1675