This TOSOT inverter PTAC delivers reliable comfort year-round with 15,000 BTU cooling and 13,500 BTU heating, handling spaces up to 850 sq. ft. — ideal for apartments, hotels, hospitals, and other residential or commercial settings. It offers two heating modes: a heat pump that pulls energy from the air for efficient warmth in moderate climates, plus a 3.5kW electric auxiliary heater for fast backup when temperatures drop below 20℉. You select between them via dip switch during installation. Inverter technology maintains precise, steady temperatures while cutting energy use by up to 30%, backed by a 10.7 EER and 11.6 COP using eco-friendly R32 refrigerant. The unit fits seamlessly into a standard wall sleeve (42" x 16" x 13¾") with an included grill, making it a solid swap for other major brands. Built to handle tough conditions, it operates from 20℉ to 115℉ with corrosion-resistant outdoor coils and freeze protection for extreme weather. Inside, it runs at just 53dB on high fan so you and your guests enjoy quiet, restful nights. A ventilation control lever allows indoor-outdoor air exchange during setup for fresher air, though it may affect efficiency. Powered by a 230V 20A LCDI plug (208/230V, 60Hz, single-phase), it works with 24V wall thermostats (not included) and is backed by a 5-year warranty from purchase.