The ornamental design for a wallhangingairconditioner, as shown and described.
FIG. 1 is a front elevation view of a wall hanging air conditioner, in accordance with the invention;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a top, front and left side perspective view thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings illustrate portions of the wall hanging air conditioner, which form no part of the claimed design.