Most central heating and cooling systems are classified as forced air systems, because they send air through ductwork for distribution. The ductwork can contain products that filter or clean the air.

Constant Comfort™ VS 90
Variable-Speed Two-Stage Gas Furnace
| ReliableDirect Hot Surface Ignition System features an advanced silicon nitride igniter for years of reliable starts. DurableThe RPJ® III primary heat exchanger is made of corrosion-resistant weld-free stainless steel. The unique integrated ripple-edged design forces more heat to the outside surface area for higher efficiencies. Heating On DemandTwo-stage redundant gas valve, two-speed induced draft blower assembly, and variable-speed motor operate normally at the lower stage and ramp up as needed. QuietVariable-speed circulation blower motor is pre-lubricated, dynamically balanced, and resilient mounted to reduce vibration and noise. System MonitoringState-of-the-art electronic controls monitor system operation and allow for advanced diagnostics, a timesaving tool for technicians.
* See published warranty for complete details. |
Constant Comfort™ VS 80
Variable-Speed Two-Stage Gas Furnace
| ReliableDirect Hot Surface Ignition System features an advanced silicon nitride igniter for years of reliable starts. DurableThe RPJ® III primary heat exchanger is made of corrosion-resistant weld-free aluminized steel. The unique integrated ripple-edged design forces more heat to the outside surface area for higher efficiencies. Heating On DemandTwo-stage redundant gas valve, two-speed induced draft blower assembly, and variable-speed motor operate normally at the lower stage and ramp up as needed. QuietVariable-speed circulation blower motor is pre-lubricated, dynamically balanced, and resilient mounted to reduce vibration and noise. System MonitoringState-of-the-art electronic controls monitor system operation and allow for advanced diagnostics, a timesaving tool for technicians.
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