The Day & Night N80ESU Gas Furnace is designed for efficient heating with an 80% AFUE rating. It features a multi-speed ECM blower motor and a single-stage gas valve for consistent comfort. The fully insulated cabinet ensures quiet operation, and the furnace is dual fuel capable, allowing integration with a compatible heat pump and thermostat for energy-saving performance. It is also compatible with air purifiers, humidifiers, and Wi-Fi enabled thermostats for enhanced control.