“can this unit be used as a built-in (through wall)? I know there are other units specifically for "Through Wall" installation but I was wondering if this unit could be used as a "Through wall) installation as well as Window? Is there a "Kit" to convert this unit to be "Built-in" I like this unit because it is 115v yet still does a large area 640sf. Most of the built-in models are 220v. Could I easily install this unit in the wall?”