I purchased a portable AC on wheels with a similar profile with dual vents that fit into a window for hurricane season and the next long term power outage, that purchase was accompanied by a portable generator and 50 Gal of gas in the garage.
Yeah, we have a 12,000 portable (er, "portable-ish") AC, has a return/circulator that hooks into a window, we figured we'd lock down and cool the master bedroom with everyone in that one room (since it's roomy, has a self-contained bathroom, etc.) We've never even opened it, hopefully, we never will