The Tempstar SmartComfort™ 94V two-stage gas furnace provides comfort and quietness with simplicity and flexibility, says the company. The furnace offers 94% AFUE and features a high-efficiency, variable-speed dc blower motor. The units have dual certification for one- or two-pipe venting, stainless steel primary and secondary heat exchangers, two-stage gas valve, and two-stage combustion blower. The furnaces are compatible with single- or two-stage thermostats and come with connections for an electronic air cleaner, humidifier, and dehumidistat.