Abstract: An air conditioner wall sleeve is et forth for use in combination with window-type air conditioning units for through-the-wall construction. The wall sleeve is of a height and depth substantially that of an associated air conditioning unit, but is of a width greater than said unit. Spacer blocks of varying dimensions are securable at a forwardmost point of respective side walls of the wall sleeve to present planar surfaces with a distance therebetween within said sleeve to substantially equal that of an air conditioning unit's width. Louvers are formed along a rear surface of said wall sleeve whereupon a gap is presented between side interior walls rearwardly of said adapters for enabling venting of heated discharge air rearwardly of said air conditioning unit and for enabling intake of fresh air to said unit.