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SL297NV Variable-Speed, Ultra-Low Emissions Gas Furnace

SL297NV Variable-Speed, Ultra-Low Emissions Gas Furnace

Offering the ultimate in comfort and emissions compliance, the SL297NV variable-speed, ultra-low NOx gas furnace produces 65% lower NOx emissions than standard low NOx furnaces. So you can feel good about your environment, inside and out.

The SL297NV is a new gas furnace product that’s available in select parts of California. If you live elsewhere in the U.S. or in Canada, ask your Lennox Dealer about the SL280V, which is also engineered for lasting reliability and efficiency.

Here are some of the top features of the SL297NV:

Heating efficiency rating of 97.5% AFUE delivers exceptional comfort and energy savings all winter long*

ENERGY STAR® certified which means the furnace meets or exceeds U.S. federal guidelines for energy efficiency.**

Variable-speed motor provides a quiet, consistent flow of air for advanced comfort, efficiency and control

Variable speed airflow prevents temperature swings and controls humidity levels for a more comfortable environment

Low fan speed option efficiently controls humidity levels and provides continuous filtration for cleaner, healthier air

iComfort-enabled technology helps maintain your home’s temperature close to your ideal setting

  • Efficiency rating of 97.5% AFUE
  • Ultra-low NOx emissions
  • SilentComfort™ Technology and Sound Absorbing Insulation
  • Two-stage, variable-speed operation
  • Dual-fuel capability
  • Enhanced humidity control
  • Lifetime limited warranty on the heat exchanger and a 5-year limited warranty on all remaining covered components.



  • DualFuel
  • EnergyStar


  • Lifetime limited warranty on the heat exchanger
  • 5-year limited warranty on all remaining covered components.

*This chart depicts potential energy savings you can expect from the SL297NV furnace, versus older furnaces with lower efficiency ratings. Criteria used in this example are 2,000 full-load heating hours, with a 60,000 Btuh heating design load and $1.368 ccf for gas. Your actual savings may vary, depending on the weather patterns in your local area, local fuel rates and your individual lifestyle.
** Select models only. See your local Lennox Dealer for more information.


Norman O.Cleburne, TX

I am extremely happy with the service I received from Southern Air. I loved their price and I really appreciated that they came when they said they would, I did the job precisely the way we discussed that it would be done.

Martha D.Fort Worth, TX

They were on time, delivered what was promised and my attic/house ended up cleaner that before they got there. They even took time to train me on the new electronic thermostat and provided a full year of service with my new system. I've recommended them to my neighbors who are going have them fix some shoddy installation on their system.

NeighborFort Worth, TX

High Standards, efficient, Good Price - Did everything exactly as quoted - no surprises.

Thada P.Crowley, TX

The salesman was knowledgeable, courteous and friendly. I received three different bids the difference between Southern Mechanical and the others was Overall Value and the best price. I even ended up replacing all my sheet metal old ductwork with new R-6 flex. You just can't beat caring attitude of the installers, office staff and my sales guy Jamie Wallace.

Patrick F.Milsap, TX

It was very professional.

Weldon H.Burleson, TX

Very satisfied with the equipment and speed of installation. They did a great job!

Ray D.Weatherford, TX

"Jamie came out to give an estimate, He was on time, professional and thorough. He was the first estimate I received and the best value after all estimates were evaluated. Hired Southern Air on Saturday and it was installed the following Tuesday. Installation crew was on time, quick and courteous. The job, estimate, install and outcome were all A++. Thanks Jamie and Wade."

Dalton T.Burleson, TX

They were great and may me feel comfortable. The same day I gave them the job, they install it that afternoon.

Dale J.Joshua, TX

They did a very good job. Showed up on time . Very reasonable. Some minor detail problems.

NeighborDallas, TX