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Carrier Performance™ Boost 90 Gas Furnace 59SP5

The multi-speed blower motor of this energy-efficient furnace can do more than just add to your comfort. Paired with the right cooling system, it can actually boost SEER levels to help you save on energy costs all year round.

Comfort is enhanced by Ideal Humidity® System technology which improves summer dehumidification from an air conditioner or heat pump. SmartEvap™ technology also aids dehumidification by periodically stopping the multi-speed fan while it's in "Constant ON" mode to give cooling condensation time to drain away deterring re-humidification by up to 10%.

  • Up to 96.5% AFUE
  • Select sizes meet ENERGY STAR® qualifications
  • Allows choices of "constant ON" fan speed operation1
  • Hybrid Heat® compatible
  • Year-round humidity management when installed as part of complete Performance system with humidifier
  • Can help boost cooling SEER efficiency when matched with appropriate cooling system components
  • Single-stage gas valve
  • Multi-speed, ECM blower motor
  • Pilot-free, hot surface PowerHeat™ ignition
  • Fixed-speed inducer motor
  • Aluminized steel clamshell-style primary heat exchanger
  • Stainless steel fin-and-tube design secondary heat exchanger
  • Sound reduction: fully insulated cabinet and QuieTech™ noise reduction
  • Recommended controls: Performance™ Edge® relative humidity or ComfortZone™ II thermostats
  • 40,000-120,000 Btu/h
  • Flexible installation: upflowdownflow or horizontal
  • Versatile venting for tight-fit applications
  • 115 V
  • .5" gas connection
  • Convertible to Liquid Propane (LP)
  • 20-gauge, galvanized steel with appliance finish
  • Baked on urethane base coat and polyester top coat paint in taupe metallic
  • Dimensions in upflow position: 35"H x width varies by size: 14.2-24.5" x 30"D
  • Efficiency: Up to 96.5% AFUE
  • Quiet Level: Good
  • Comfort Features: Better
"Rod did a good job explaining what systems would work in my home configuration. Kevin and Ryan on the install were rock stars and did a super job...

Doug - Seattle, WA

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"I would recommend MM systems and the Lennox G71 Furnace and Lennox Xp15 Heat Pump systems to others"

Puneet - Renton, Wa

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"Fabulous stress free experience. Wonderful sales person - very kind. Installers here all day, great guys. Electrician did a nice neat job on new...

Richard - Redmond, WA

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