The ornamental design for a ceiling-mounted air conditioner, as shown and described.
FIG. 1 is a perspective view of a ceiling-mounted air conditioner, showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is an enlarged view of the encircled portion 8 in FIG. 1;
FIG. 9 is an enlarged view of the encircled portion 9 in FIG. 1;
FIG. 10 is an enlarged view of the encircled portion 10 in FIG. 1; and,
FIG. 11 is an enlarged view of the encircled portion 11 in FIG. 1.
The evenly spaced dashed broken lines depict portions of the ceiling-mounted air conditioner that form no part of the claimed design. The dot-dot-dash broken lines in FIGS. 1, 8, 9, 10 and 11 encircling portions of the drawing disclosure illustrated in an enlargement form no part of the claimed design.