I need to install an air conditioner in a room addition. The problem is that the walls are 9" thick and a window mount A/C unit is not deep enough to allow the side vents to be unobstructed. Does some company make a unit designed for a thick wall mounting instead of a window mount? I live in Mexico and don't have easy access to dealers to ask this question so I would appreciate you pointing me in the right direction. Any web sites you know of with this kind of info would be helpful. Thanks.