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| Square Footage | Furnace BTU |
|---|---|
| 1,000-1,200 sq. ft. Home | 40,000 - 60,000 BTU |
| 1,200-1,500 sq. ft. Home | 60,000 BTU |
| 1,500-1,800 sq. ft. Home | 60,000 - 80,000 BTU |
| 1,800-2,500 sq. ft. Home | 80,000 - 100,000 BTU |
| 2,500-3,500 sq. ft. Home | 100,000 to 120,000 BTU |
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.
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.
| Feature | Details |
|---|---|
| Average Installed Price (Canada) | $7,000 – $7,600 |
| AFUE | 97.5% |
| Burner Type | Two-stage |
| Blower | Variable-speed |
| ENERGY STAR® | Most Efficient (2021) |
| Best For | Cold climates, eco-focused homeowners |
| Standout Feature | Ultra-low NOx emissions |
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
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 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.
| Specification | Value |
|---|---|
| AFUE | 97.5% |
| Burner | Two-stage |
| Blower Motor | Variable-speed |
| ENERGY STAR® Certified | Yes |
| Fuel Type | Natural gas / propane |
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
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.
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.
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
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
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
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.
| Feature | SL297NV | ML196E |
|---|---|---|
| AFUE | 97.5% | 96% |
| Heating Stages | Two-stage | Single-stage |
| Blower | Variable-speed | Constant torque |
| Best For | Cold climates, large homes | Smaller homes |
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.
| Feature | SL297NV | EL196E |
|---|---|---|
| Burner | Two-stage | Single-stage |
| Blower | Variable-speed | Constant torque |
| Comfort Level | Excellent | Good |
| Noise | Very quiet | Moderate |
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.
| Feature | SL297NV | SLP99V |
|---|---|---|
| AFUE | 97.5% | 99% |
| Burner | Two-stage | Modulating |
| Emissions | Ultra-low NOx | Standard low-NOx |
| Best For | Eco-focused homes | Maximum efficiency |
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.
The installation or replacement cost of any furnace, air conditioner, or heat pump in Canada can vary based on several important factors:
Size of the home and required furnace sizing
Your province and climate conditions (Ontario, hamilton, burlington, etc.)
Overall installation difficulty and labour hours
The need for ductwork upgrades
Pricing and experience of local HVAC contractors
We proudly help homeowners across Canada compare furnace prices, get installation quotes, and find trusted HVAC contractors. Here are some of the top cities where we provide service:
Hamilton • Burlington • Brantford • Cambridge • Kitchener • Milton • Oakville
Whether you’re upgrading your furnace, replacing an old system, or comparing HVAC quotes, our certified contractors are available to assist you in all major regions across Ontario and beyond.
Get free quotes from trusted HVAC professionals in your city and compare furnace installation costs instantly.
We partner with installers affiliated with recognized industry organizations, including:
These affiliations ensure reliable service, certified expertise, and consistent installation quality across Canada.
Is the Lennox SL297NV worth the price?
Yes, for homeowners prioritizing efficiency, quiet operation, and ultra-low emissions.
Does it qualify for rebates in Canada?
Often yes, depending on provincial and utility programs.
Is it good for cold Canadian winters?
Absolutely—it’s designed for extended heating cycles and low outdoor temperatures.
Can it work with a heat pump?
Yes, it supports dual-fuel operation.
Homeowners in cold or extended winter climates
Those seeking lower emissions and energy savings
Large homes needing consistent, quiet heating
Small homes or condos
Buyers on a tight budget
Homeowners who want a unit replacement warranty
Thinking about upgrading to the Lennox SL297NV Furnace Review?
Compare installation costs, check rebate eligibility, and get free quotes from certified local HVAC contractors to see if this furnace is the right fit for your home.
