Well the 1920's building has steam heat..no air conditioning. So I have a dozen or more window units that I install for tenants. But I live only 4-5 blocks from Lake Michigan, and evenings are usually very tolerable with just a box fan in the bedroom window, rotating on slowest speed. So I seldom install an a/c. I can always go down to the condo on the 36th floor and sleep there if things get really bad. But I get up several times during the night. And even if I'm sleeping in the bedroom down the hall, Sari claims it disturbs her sleep. So I often sleep in the apartment in my building that I've claimed for office space.
And outside the bedroom there is my 40'x100' patio and garden space, filled with trees and plants, all giving off Negative Ions
! My own mini-version of Ratlum Mountain! But after 5 days I still benefited from that shower!