FIG. 1 is a bottom perspective view of a ceiling-mounted air conditioner showing our new design;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a front elevation view thereof;
FIG. 7 is a rear elevation view thereof; and,
FIG. 8 is an enlarged view of the portion 8 encircled in FIG. 1.
The dashed broken lines in the figures depict portions of the ceiling-mounted air conditioner that form no part of the claimed design. The dot-dash broken lines in the figures, encircling a portion of the claimed design that is illustrated in an enlarged view, form no part of the claimed design.