They forget to say that the larger the room volume the more it will cost to cool. I have divided both our bedrooms Scandinavian style with glass wall dividers and a sliding door, so that one half holds the bed only and the other half holds the wardrobes etc. i.e. a dressing room and small sitting room. Therefore a much smaller volume to cool at night and during the day in the dressing/sitting room but still have the sensation of relative spaciousness. Each original bedroom was L6m x W3m x H3m. Our living room is huge and costs a fortune to cool during the day. Hence looking at getting solar panels for use during the day