We're getting them installed this year, and are doing so exclusively for the cooling aspect. I'm in PWM so we're not nearly as hot as SNE, especially with the sea breeze, but we've been using window units more and more frequently the last few years and I don't see that changing, so why not reduce the electric cost. I'm sure ROI will be a few years, but I won't ever have to install (or listen to them) again so that's a win.