Gotta give those people credit. I bet they slept pretty good at night. I have a similar wall unit in our S&B bedroom, so I don't have to run our central unit to cool 2000 sq. ft. for just the DW & I. I have yet to experience a hot day in our GK, so not sure how it will do. Will take your experience/fix on the ducting before we pull out next year to FT.
Ken & Patty
2015 38GK Onan DW W-D Disks MorRyde IS & Pin-box Trav'ler 2015 GMC Denali 3500HD DRW Duramax
"Who lives sees much; Who travels sees more!"