I purchased the 18k and 22k Dual Inverter AC units and had them installed in my wall.  These are game changers for window/wall mounted AC units. They not only keep the entire first floor dry and cool (on Long Island) but they are silent compared to aby other units in the market.  The 22k unit is above my kitchen table and cools a large family room all with high ceilings.  I used to turn the AC off so we could talk during dinner or watch a movie.  Those days are gone!  I cant speak long term as these are new but I will update this review gong forward.  So far, GAME CHANGER!!!