Lennox SL297NV
Signature Series Gas Furnace
97% AFUE variable-capacity performance — the pinnacle of Lennox furnace efficiency for Chicago winters.
IL License #2183457 · D's Air & Heating, Inc. · Chicago, IL
Model Specifications
Key Features
- 97% AFUE — only 3% of fuel escapes as exhaust
- Variable-capacity operation adjusts in 1% increments
- Variable-speed ECM blower for quiet, even airflow
- Whisper-quiet operation as low as 56 dB
- iComfort S40 compatible for full system intelligence
- 20-year heat exchanger / 10-year parts warranty
About the Lennox SL297NV
The Lennox SL297NV is the flagship Signature Series gas furnace, delivering 97% AFUE efficiency with variable-capacity operation. It modulates heat output in 1% increments to maintain precise temperatures and minimize energy waste — ideal for Chicago's demanding winters.
D's Air & Heating, Inc. is a Lennox Premier Dealer serving Chicago's West Side. We install the SL297NV with full permits, two-pipe PVC venting, and warranty registration. The 20-year heat exchanger warranty is among the best in the industry.
Recommended Add-Ons
Lennox iComfort S40 Smart Thermostat
Full variable-capacity furnace integration
Lennox PureAir S Air Purification
Hospital-grade whole-home air purification
Lennox Healthy Climate Power Humidifier
Whole-home steam humidification
Maintenance Agreement — 15% Off
Annual tune-up + priority service + 15% off repairs
What Chicago Homeowners Say
Barely hear it running
The SL297NV is so quiet I have to check the thermostat to know it's on. House stays perfectly warm all winter.
Barbara W. — Oak Park
Gas bill dropped significantly
97% AFUE is no joke. Our gas bill is noticeably lower since D's Air installed the SL297NV.
Thomas H. — River Forest
Premier Dealer quality
Darryl's team did a flawless two-pipe PVC install and registered our 20-year warranty. Outstanding.
Renee C. — Forest Park
D's Air Service Call Policy
Ready for the Most Efficient Lennox Furnace?
D's Air & Heating, Inc. · (773) 940-0965 · [email protected] · IL License #2183457