Backed by the intelligent Infinity control, this furnace offers communicating variable-speed, constant airflow (VCA) ECM blower motor for electrically efficient operation all year long in heating, cooling and continuous fan operation. This two stage furnace will run in low stage up to 90% of the time. Longer, low-stage run times give you better energy efficiency, better temperature control and increased comfort. It also assures you quieter performance. Ideal Humidity System™ technology can dehumidify a home without a call for cooling for improved home comfort during the humid summer months.