We know about swamp coolers. They are used a lot here because of the low humidity. There is in fact a derelict one attached to the "granny hutch" in the house. But Lisa won't install them. She doesn't like how (as you note) they can cause water-related trouble. In the very short-term, she improvised a kind of short-range swamp cooler in the living room by attaching a portable misting sprayer to a box fan, but it's not the planned long-term solution.

She's familiar with the use of swamp coolers — although she lived in the wet part of Oregon for many years, she's actually from Los Alamos NM — but is not fond of them.