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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 SLP99V Furnace Review sits at the top of Lennox’s lineup and is widely regarded as the most efficient residential furnace available today. Built for homeowners who want maximum comfort, ultra-quiet operation, and industry-leading energy efficiency, this variable-capacity gas furnace delivers exceptional performance—at a premium price.
This review explains whether the Lennox SLP99V Furnace Review is worth the investment for Canadian homes by covering efficiency, features, installation cost in Canada, warranty, noise levels, and comparisons with other Lennox models.
Average Installed Price (Canada): $7,200 – $7,800
AFUE: 99%
Burner Type: Modulating (variable-capacity)
Blower: Variable-speed
ENERGY STAR® Certified: Yes (Most Efficient)
Best For: Large homes, cold climates, homeowners who want the highest efficiency and quietest performance available.
Unmatched Efficiency: 99% AFUE—nearly all fuel becomes usable heat
Ultra-Precise Comfort: Modulating burner adjusts in 1% increments
Whisper-Quiet Operation: SilentComfort™ Technology minimizes noise
Even Temperatures: No hot or cold spots, excellent humidity control
Smart-Home Ready: Works with iComfort® S30 thermostat
Dual-Fuel Capable: Pairs with a Lennox heat pump for added savings
ENERGY STAR® Most Efficient (2021)
Variable-capacity operation for ultra-precise comfort and efficiency
SilentComfort™ Technology for whisper-quiet performance
Excellent humidity control and even heat distribution
Duralok Plus™ Heat Exchanger made with durable ArmorTuf™ steel
Condensing design to recover more heat from exhaust gases
Precise Comfort® Technology keeps temperatures consistent
Dual-fuel compatibility — pairs with a Lennox heat pump for maximum efficiency
Compatible with humidifiers, air filters, and the Lennox Ultimate Comfort System™
If you want the most efficient, quietest, and most advanced furnace Lennox makes, the Lennox SLP99V Furnace Review is it. Its 99% AFUE rating, modulating heat output, and variable-speed airflow deliver unmatched comfort and energy savings—especially in cold Canadian climates.
While it’s one of the most expensive furnaces on the market, homeowners with high heating demands or large homes will benefit the most from its long-term performance and efficiency.
| Specification | Details |
|---|---|
| AFUE | 99% |
| Burner Type | Modulating |
| Blower Type | Variable-speed |
| ENERGY STAR® | Yes |
| Heating Stages | Variable-capacity (1% increments) |
The SLP99V belongs to the Dave Lennox Signature Collection, meaning it includes Lennox’s most advanced engineering. At its core is Precise Comfort® Technology, allowing the furnace to continuously adjust heat output and airflow for perfect indoor comfort.
A Duralok Plus™ heat exchanger made from ArmorTuf™ steel improves durability and heat transfer, while the condensing design recovers additional heat from exhaust gases to boost efficiency.
With a 99% AFUE, the SLP99V converts $0.99 of every dollar spent on fuel directly into heat. Its modulating burner and variable-speed blower reduce temperature swings, improve comfort, and lower long-term heating costs compared to single- or two-stage furnaces.
This is the quietest furnace Lennox has ever built. SilentComfort™ Technology uses sound-absorbing insulation and smooth start/stop operation to dramatically reduce noise—ideal for open-concept homes or furnaces installed near living spaces.
When paired with the iComfort® S30 Smart Thermostat, the SLP99V offers:
Geofencing for automatic energy savings
Indoor/outdoor air quality monitoring
Automatic system diagnostics and alerts
Voice control via Alexa, Google Assistant, and Apple HomeKit
Lifetime limited warranty on the heat exchanger
10-year limited warranty on parts
Registration required within 60 days
Professional installation mandatory
Note: Lennox does not include a full unit replacement warranty, even on flagship models.
Pros
Highest efficiency available (99% AFUE)
Extremely quiet operation
Best temperature consistency and humidity control
Ideal for cold climates and large homes
Cons
Very high upfront cost
Premium features may be overkill for small homes
No unit replacement warranty
The Merit ML193E is an entry-level, budget-friendly option priced around $4,000–$4,500 installed.
However, it has single-stage operation, a constant torque blower, and an AFUE of 93% — meaning it’s less efficient, noisier, and not ideal for large or cold-climate homes.
It also lacks ENERGY STAR® certification, so it won’t qualify for most rebates available for high-efficiency models like the SLP99V.
In fact, with Canada’s current minimum AFUE requirement of 95%, the ML193E may no longer be available in some regions.
| Feature | SLP99V | ML193E |
|---|---|---|
| Installed Price (Canada) | $7,200–$7,800 | $4,000–$4,500 |
| AFUE | 99% | 93% |
| Heating Type | Modulating | Single-stage |
| Blower | Variable-speed | Constant torque |
| ENERGY STAR® | ✅ Yes | ❌ No |
| Best For | Large / cold-climate homes | Budget, mild climates |
Verdict: ML193E is cheaper but far less efficient. SLP99V is the clear choice for cold Canadian climates and long-term savings.
The EL196E is part of the mid-tier Elite Series. It features a single-stage burner, constant torque blower, and a 96% AFUE — a step down in performance and energy savings compared to the SLP99V.
While it’s compatible with Amazon Alexa and Apple HomeKit via a smart thermostat, it lacks the advanced modulation, humidity control, and ultra-quiet operation of the SLP99V.
It’s a solid choice for smaller homes, but not for those seeking premium comfort or top-tier efficiency.
| Feature | SLP99V | EL196E |
|---|---|---|
| AFUE | 99% | 96% |
| Heating Type | Modulating (1% increments) | Single-stage |
| Blower | Variable-speed | Constant torque |
| Noise Level | Ultra-quiet | Moderate |
| Comfort Control | Advanced | Basic |
| Best For | Premium comfort seekers | Smaller homes |
Verdict: EL196E is solid for smaller homes, but SLP99V delivers far superior comfort, quietness, and efficiency.
The SL297NV, another member of the Dave Lennox Signature Collection, is the closest competitor to the SLP99V within the Lennox lineup. It also features a variable-speed blower and compatibility with iComfort® S30 and PureAir™ systems.
However, it’s a two-stage furnace, not a modulating one, so it can only toggle between high and low heat levels — offering less precision and comfort control. Its AFUE rating of 97.5% is slightly lower, but it does deliver ultra-low NOx emissions and has also been recognized as an ENERGY STAR® Most Efficient 2021 model.
For most homeowners, the SL297NV offers a balance between cost and performance, while the SLP99V remains the ultimate choice for those wanting maximum efficiency and luxury comfort.
| Feature | SLP99V | SL297NV |
|---|---|---|
| AFUE | 99% | 97.5% |
| Heating Type | Modulating | Two-stage |
| Blower | Variable-speed | Variable-speed |
| NOx Emissions | Standard low | Ultra-low NOx |
| Comfort Precision | Maximum | High |
| Price | Highest | Slightly lower |
Verdict: SL297NV offers excellent balance and low emissions, but SLP99V remains the top choice for maximum efficiency and luxury comfort.
The Lennox SLP99V Furnace Review is the most advanced residential furnace available, combining cutting-edge technology, exceptional energy efficiency, and whisper-quiet performance.
It’s ideal for homeowners who:
Live in cold climates
Want the most efficient furnace possible
Prefer smart, automated comfort control
Have a large home or high heating demands
While it’s one of the most expensive models on the market, the long-term savings, performance, and comfort make it an excellent investment for those who want the best that Lennox has to offer.
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 SLP99V worth the price?
Yes—if you want maximum efficiency, quiet operation, and premium comfort in a cold climate.
Is it too much for a small home?
Often, yes. Smaller homes may not benefit fully from its advanced modulation.
Does it qualify for rebates in Canada?
It often qualifies for top-tier efficiency incentives, depending on province and program availability.
Thinking about upgrading to the Lennox SLP99V Furnace?
Compare installation costs, explore rebate eligibility, and get free quotes from trusted local HVAC contractors to see if this furnace fits your home and budget.
