Dave Lennox Signature Collection SL297NV Review

🔥Lennox SL297NV Furnace Review

The Lennox SL297NV Furnace Review sits in the Dave Lennox Signature Collection and represents one of the most advanced two-stage, variable-speed gas furnaces available in Canada. While it’s not Lennox’s absolute top model, it delivers near-flagship performance with a strong focus on ultra-low emissions, quiet operation, and long-term energy savings.

Designed specifically for environmentally conscious homeowners and cold-climate performance, the SL297NV combines high efficiency with industry-leading NOx reduction—making it a standout option for Canadian homes.

⚠️ Discontinued or Limited Inventory Notice

This model may have limited availability depending on region and distributor. Availability can vary across Canada, so homeowners should confirm with local Lennox dealers before planning installation.

⭐ In a Nutshell — Lennox SL297NV

💡 Key Benefits

• Ultra-low NOx emissions (up to 65% lower than standard low-NOx furnaces)

• 97.5% AFUE efficiency for reduced gas consumption

• Two-stage heating for smoother, more consistent comfort

• Variable-speed blower for quieter operation and improved humidity control

• ENERGY STAR® Most Efficient recognition

• Smart thermostat compatibility for advanced control and diagnostics

• Dual-fuel capable when paired with a Lennox heat pump

⭐Top Features

• Ultra-low nitrogen oxide (NOx) emissions

• ENERGY STAR® Most Efficient 2021

• Lowest emissions of any furnace on the market

• Quiet, reliable performance with SilentComfort™ technology

• Variable-speed blower for improved humidity and comfort

• High-efficiency 97.5% AFUE rating

• Compatible with Lennox PureAir™ and PureAir™ S systems

• Uses SureLight® silicon nitride ignitor

• Factory-tested for lasting reliability

🏆 The Bottom Line

The Lennox SL297NV Furnace Review is built for homeowners who want premium comfort, environmental responsibility, and long-term savings. Its combination of two-stage heating, variable-speed airflow, and ultra-low emissions makes it ideal for larger homes and colder Canadian regions.

While the upfront cost is higher than mid-tier models, the energy savings, rebate potential, and reduced environmental impact make it a strong long-term investment.

⚙️ Product Specifications

🛠️ Design & Performance Features

The SL297NV emphasizes engineering precision over flashy add-ons. Its standout feature is the premix burner design, which delivers extremely clean combustion and ultra-low emissions.

Additional design highlights include:

• Insulated blower compartment for quieter operation

• Ultra-low continuous fan mode for even airflow

• Factory testing for durability and reliability

• Dual-fuel compatibility for optimized energy use

⚙️ Core Performance & Efficiency

With a 97.5% AFUE, nearly all the fuel consumed is converted into usable heat. The two-stage burner adjusts between low and high output based on demand, while the variable-speed blower fine-tunes airflow—reducing temperature swings and energy waste.

Paired with a heat pump, the SL297NV can operate in dual-fuel mode, automatically switching between electricity and gas to minimize heating costs during milder winter conditions.

🔇 Noise & Comfort

Thanks to SilentComfort™ technology, the SL297NV operates significantly quieter than standard furnaces. Variable-speed airflow, internal insulation, and controlled burner staging work together to deliver smooth, low-noise heating, even during long heating cycles.

👁️ Smart & Connected Features

When paired with the iComfort® S30 smart thermostat, homeowners gain:

• Geofencing for automatic energy savings

• Indoor air quality and pollen monitoring

• Remote diagnostics sent directly to your HVAC dealer

• Voice control via Alexa, Google Assistant, and Apple HomeKit

🧾 Warranty Coverage

Lennox provides solid—but not industry-leading—warranty protection:

• Lifetime warranty on the heat exchanger

• 10-year warranty on parts (registration required within 60 days)

⚠️ Note: Lennox does not include a full unit replacement warranty, even at this premium price point.

➕ Pros & Cons

Pros

• Exceptional efficiency and low emissions

• Very quiet operation

• Strong rebate potential

• Excellent comfort in cold climates

Cons

• High upfront installation cost

• No unit replacement warranty

• Overkill for small homes or mild climates

🔍Comparable Lennox Models

Lennox SL297NV vs. Other Lennox Models

1. SL297NV vs. ML196E (Price Comparison)

• ML196E is an entry-level model from the Merit Series, priced around $4,200 – $4,800 installed.

• It features single-stage operation and a constant torque blower, compared to the SL297NV’s two-stage and variable-speed setup.

• Both models have secondary heat exchangers for high efficiency, but the ML196E (96% AFUE) is better suited for smaller homes or milder climates, while the SL297NV excels in colder regions or larger spaces.

2. SL297NV vs. EL196E (Feature Comparison)

• The EL196E belongs to the mid-tier Lennox Elite Series.

• It’s a single-stage furnace with a constant torque blower and 96% AFUE efficiency.

• The SL297NV’s two-stage burner and variable-speed motor deliver quieter operation, more even heat, and better humidity control.

• Overall, while both are efficient, the SL297NV offers superior comfort and control.

3. SL297NV vs. SLP99V (Tier Comparison)

• The SLP99V is Lennox’s top-of-the-line furnace and the most efficient model available, with an incredible 99% AFUE.

• It features modulating heat output (1% increments) and a variable-speed blower for ultimate comfort, quietness, and savings.

• However, the SL297NV remains unique for its ultra-low NOx emissions, making it the better choice for homeowners who prioritize environmental sustainability.

✅Final Verdict

The Lennox SL297NV Furnace Review delivers exceptional performance, ultra-low emissions, and near-top-tier efficiency. Its advanced two-stage operation and variable-speed blower make it one of the quietest and most comfortable furnaces in the market.

While it’s a premium investment, the energy savings, rebate eligibility, and environmental benefits make it a smart choice for homeowners looking for long-term value and cleaner air.

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