Packaged terminal air conditioners (PTACs) are horizontally orientated and are 42"L x 16"H in size to fit into wall slots below windows to offer cooling and heating for a single room. They mount to a wall sleeve, which provides a stable platform for the PTAC and allows units to be serviced or replaced out as needed. PTACs take up very little space in a room and do not require ductwork. Hotel rooms, multi-unit complexes, assisted-living centers, and room extensions are all examples of where they're used. A leakage current detector interrupter (LCDI) detects current leakage and interrupts a circuit to assist avoid injuries and damage to equipment or the environment.