Wall air conditioners install in an exterior wall opening to provide conditioned air while taking up minimal space within a room. Wall units for cooling are used for seasonal cooling or supplementing central AC systems. Wall units with heat provide cooling and heating from a single unit for year-round use. Through-the-wall and packaged terminal air conditioners (PTACs) mount into a wall sleeve that supports the unit within a wall and blow conditioned air directly from the unit into a single room. Vertical packaged air conditioners (VPACs) install in a utility closet along an outside wall and connect to ducting for delivering conditioned air to one or more rooms.