Goodman GCVC960603BN 2-Stage Downflow/Horizontal Gas Furnace is designed to heat your home’s air using Natural gas as fuel. It blows hot air through ducts to deliver warm air via grills or air registers. This gas furnace features an integrated communicating ComfortBridge™ Technology and Color-coded low-voltage terminals with provisions for electronic air cleaner. As ComfortBridge technology gathers data, it uses it to make automatic adjustments; this technology uses the minimum amount of energy required to create consistent and comfortable indoor heating and cooling. The two-stage gas valve provides quiet, economical heating and an efficient, quiet variable-speed airflow system gently ramps up or down according to heating or cooling demand. Continuously monitors the system for consistent, reliable operation, stores last diagnostic codes in memory; and indicates condition through a 7-segment display for quick troubleshooting.