Regarding Saturday HHH, we have an open concept great room with 20' cathedral ceilings. Total sqft including foyer and kitchen is 740sqft. Too late to get a mini split, so was thinking of 12,000 btu window rattler. With all the open space, I'm not sure how effective a window unit will be, so burning $450 may be a waste. Plus we have large windows that lets the sun in, so I'm thinking the unit will provide little relief for our BBQ guests.