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Best : Infinity Series (80% AFUE)

Infinity® 80 Gas Furnace

Southern climates with short, mild winters may not call for the highest degree of efficiency. As part of an Infinity communicating system, you can pair this model with a high–efficiency heat pump or air conditioner and gain a cooling efficiency boost from its variable–speed blower. You also get to enjoy better temperature control and longer, quieter, low–speed operation.

Key Features

  • Up to 80.0% AFUE heating efficiency
  • Two–stages of heat for economical operation
  • Variable–speed, ECM blower motor for ultimate comfort and ultra–quiet operation and best in class electrical efficiency
  • Ideal Humidity System® technology capable to aid heat pump or air conditioner summer dehumification
  • SmartEvap technology works in concert with your cooling system to aid summer dehumidification
  • ComfortFan technology allows fan–speed choices in "Constant ON" mode
  • Infinity intelligence enables self–configuration and easy troubleshooting with Infinity control
  • Fully insulated cabinet
  • Advanced temperature control
  • 10–year parts limited warranty1
  • 20–year heat exchanger limited warranty2


  • Low stage operation up to 90% of time for quiet, energy–efficient operation
  • Allows 4 choices of "constant ON" fan speed operation
  • Hybrid Heat® compatible
  • Exceptional year–round humidity management when installed as part of complete Infinity system with added humidifier
  • Can help boost cooling SEER efficiency when matched with appropriate cooling system components


  • Ideal Humidity System technology capable
  • ComfortFan technology for better airflow control
  • Variable–speed blower motor


  • Two–stage gas valve
  • Variable–speed, ECM blower motor
  • Pilot–free, hot surface PowerHeat ignition
  • Two–speed inducer motor
  • Aluminized steel clamshell–style primary heat exchanger
  • Sound reduction: fully insulated cabinet and QuieTech noise reduction
  • Infinity level advanced diagnostic intelligence
  • Recommended control: Infinity control

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