Lennox Furnace Review 2025: Energy Efficiency and Innovation
Modernize Rating: 4/5
Average Cost:$3,200 - $10,000
Here’s an in-depth review of Lennox furnaces, including their services, pricing, customer experiences, and how they compare to other providers.
Our Verdict: Lennox is a strong option for homeowners who want premium energy efficiency and advanced technology. However, it may not be the best fit for homeowners seeking budget-friendly furnaces or low-cost repairs.
Modernize maintains homeowner-first editorial integrity, meaning we accept no commissions and no partner links for this review. Our reviews are thoroughly fact-checked by our home improvement experts. Ratings are determined by a sophisticated algorithm to rate brands, including analyses of products, materials, quality, costs, sizes, durability, energy efficiency, and warranties.
With more than 125 years in business, Lennox is one of the most established names in the HVAC industry, known for pioneering high-efficiency heating and cooling solutions and continuing to innovate with industry-leading technology. Founded in 1895, the company has built a reputation for comfort, durability, and efficiency. Lennox products are available nationwide in the U.S. and Canada through authorized dealers, and its portfolio includes residential and commercial furnaces, air conditioners, and heat pumps.
Fast Facts
Lennox Furnace Fast Facts
Best for
Top Model
Cost Installed
Standout Feature
Warranty
Homeowners who want premium efficiency
Signature Collection SLP99V
3,200
AFUE ratings up to 99%
10-year limited parts, lifetime heat exchanger
Why We Love Lennox Furnaces
Lennox furnaces stand out for cutting-edge technology and impressive energy efficiency. With AFUE ratings reaching 99%, they are among the most efficient furnaces available, helping homeowners reduce long-term heating costs. Many models feature Precise Comfort™ technology, which automatically adjusts heat output for consistent indoor temperatures. Lennox also has a reputation for quiet operation and sleek design.
Pros and Cons of Lennox Furnaces
Pros
Industry-leading energy efficiency (up to 99% AFUE)
Advanced technology, including Precise Comfort™ modulation
Quiet operation and strong comfort control
Cons
Premium price compared to many competitors
Costly repairs due to specialized parts
Fewer budget-friendly options
Types of Lennox Furnaces
Lennox furnaces come in three main categories to meet different heating needs:
Single-Stage Furnaces: Entry-level models such as the Merit Series ML180E run at full capacity when on. Reliable and affordable, but less efficient.
Two-Stage Furnaces: Elite Series models like the EL296E offer two heating levels — lower capacity most of the time to save energy, higher capacity on the coldest days.
Variable-Capacity Furnaces: Signature Collection models such as the SLP99V modulate output for top-tier efficiency and comfort.
Top Lennox Furnaces
Lennox Signature Collection SLP99V: Variable-capacity flagship with a 99% AFUE rating, delivering exceptional efficiency and whisper-quiet performance.
Lennox Elite Series EL296E: Popular two-stage model up to 96% AFUE; a strong balance of efficiency and value.
Lennox Merit Series ML180E: Dependable single-stage furnace at 80% AFUE; a budget-friendly entry to the brand.
Customer Reviews and Ratings
Lennox reviews are mixed. Some homeowners praise the furnaces for energy savings, quiet operation, and advanced technology. Many report lower monthly heating bills after upgrading to a high-efficiency model and like the integration with smart thermostats. On the downside, some customers report frequent repairs, high upfront costs, and expensive parts. Availability of authorized service can be more limited in rural areas.
Great furnace. Quiet. I like the fact the energy efficient fan can run all the time, keeping constant filter-cleaning airflow and even temperatures throughout the house. One complaint though is that I would like to be able to temporarily quickly modify the temperature by a one button push up or down when I am feeling cold or warm, instead of needing to change the season temperature setting. – Lennox website review
Although not a true variable speed, the fan does range through 3-speeds as it ramps up to meet cooling or heating loads. For a good part of the spring and fall it never needs to go into high speed. This along with the insulated panels make this a very quiet unit. There are multiple setup options, making this furnace very adaptable as well. I’ve had it for one year now and don’t have any complaints. Works well with my Ecobee smart thermostat and Bosch inverter heat pump. – Lennox website review
Cost of Lennox Furnaces
Lennox furnaces are premium products, and pricing reflects their efficiency and features. Here’s what homeowners can expect to pay in 2025, including installation:
Merit Series: $3,200 to $4,700
Elite Series: $4,700 to $6,800
Signature Collection: $6,800 to $10,000
Factors That Affect Your Costs
Furnace size and heating capacity
AFUE rating and efficiency
Installation complexity and ductwork
Regional labor rates
Add-ons such as smart thermostats or air filtration
Which Lennox Furnace is Right for My Climate?
Choosing the right Lennox furnace depends largely on your local climate and heating needs. The AFUE rating of the furnace is crucial — colder climates typically require furnaces with higher AFUE ratings to efficiently manage heating costs.
Find your zone below to find your AFUE rating:
1, 2, 3: 80% AFUE
4: 90% to 93% AFUE
5: 93% to 95% + AFUE
For instance, if you live in California (Zone 2 or 3), where winters are relatively mild, a furnace with an 80% AFUE rating should be sufficient. The Lennox Merit Series ML180E is a great option, with a unit price of around $3,500, and the total cost with installation can reach approximately $5,000.
However, if you reside in New York (Zone 5), where winters can be harsh, a high-efficiency model is essential for keeping energy costs manageable. The Lennox Signature Series SLP99V, with its impressive 99% AFUE rating, is a top-of-the-line choice. For a 2,000-square-foot home, the unit costs about $7,000, and with installation, the total can range from $8,500 to $10,000.
When upgrading to a Lennox furnace, consider pairing it with a Lennox air conditioning or heat pump system for year-round comfort. Lennox offers HVAC systems that work together seamlessly, often resulting in package deals that can save you money while maximizing your home’s energy efficiency.
How Lennox Compares to Other Providers
In the table below, we with some of the best furnace brands such as Bryant, Amana, and American Standard. Lennox typically offers the highest peak efficiencies and most advanced modulation, while some competitors deliver similar comfort at a lower upfront cost.
Durable, efficient, wide model range, strong reliability
Often pricier than value brands; fewer cutting-edge features than Lennox
Frequently Asked Questions
What is the typical lifespan of a Lennox furnace?
With proper maintenance, most Lennox furnaces last 15 to 20 years, and high-end models can sometimes exceed 25 years.
What kind of warranty does Lennox offer?
Lennox offers a 10-year limited parts warranty and a lifetime heat exchanger warranty on many models. Extended coverage may be available through authorized dealers.
Are Lennox furnaces expensive to repair?
Repairs can be more expensive than average because of specialized parts and advanced technology. Using an authorized Lennox contractor helps ensure proper parts and expertise.
Final Verdict: Should You Choose a Lennox Furnace?
Lennox furnaces are an excellent choice for homeowners who want premium efficiency, advanced technology, and quiet comfort — especially in colder climates where high AFUE ratings can meaningfully reduce energy use. If you prefer a lower upfront price or minimal repair costs, consider strong mid-tier alternatives. For homeowners ready to invest in long-term comfort and performance, Lennox is a smart pick.
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