Lennox Furnaces

Everything you need on Lennox Furnaces, including model details, industry rankings and customer reviews, all in one place.

Lennox Furnace Overview

Lennox opened its doors in Marshalltown, Iowa in 1895. Lennox is named for founder Dave Lennox, who created a riveted-steel, coal-fired furnace as one of the company’s first products. Nowadays, Lennox manufactures both gas and oil furnaces, organizing models by both price and efficiency. The company uses AFUE (Annual Fuel Utilization Efficiency) to describe each model’s energy efficiency

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Consumer Reviews of Lennox

2.6

  • Very Satisfied
    86
  • Somewhat Satisfied
    5
  • Neutral
    8
  • Somewhat Unsatisfied
    20
  • Very Unsatisfied
    135
  • #15 of 86 Furnaces
  • 35.83% of customers recommended

The defining feature of Lennox furnaces is Precise Comfort technology, which maximizes your home’s comfort while maintaining energy efficiency. This technology allows your furnace to make adjustments to its heat output. In milder climates, Lennox furnaces use very low airspeed and a small flame to circulate minimal amounts of warm air throughout your home. The furnace creates a larger flame and uses a higher airspeed when your home needs substantial heating.

During summer months, Lennox furnaces provide a continuous flow of filtered air while simultaneously reducing your home’s humidity. 

Lennox furnace series and models

Lennox offers 22 dual-fuel capable gas and oil furnaces. This section covers five top models. In each case, pricing can vary based on factors like unit type and home size. Consult a local HVAC professional for the most accurate quotes.

SLP98V | Up to 98.7% AFUE

The SLP98V Lennox gas furnace has industry-leading efficiencies, including up to 98.7% AFUE, which can save you hundreds in utility costs annually. This model earned ENERGY STAR Most Efficient status in 2020.

Features

  • Modulating heat stages
  • SilentComfort Technology
  • Insulated blower compartment
  • SureLight Silicon Nitride Ignitor

Technical Specs

  • Variable-speed motor
  • Enhanced humidity control
  • Insulated blower compartment
  • Air filter and humidifier capabilities
  • Ultra-low continuous fan

Efficiency

  • Up to 98.7% AFUE
  • ENERGY STAR qualified

Pricing

  • Lennox furnace pricing: $2,230.00
  • Furnace installed: $3,790
  • Air and heating installation: $8,260

SL297NV | Up to 97.5% AFUE

Experience all-around comfort when selecting the SL297NV Lennox gas furnace. This ultra-low NOx gas furnace features a revolutionary design that produces 65% lower NOx emissions compared to other low NOx furnaces. 

Features

  • Two-stage heating
  • SilentComfort technology
  • Variable-speed motor
  • Insulated blower compartment
  • SureLight Silicon Nitrade Ignitor

Technical Specs

  • Enhanced humidity control
  • Air filter and humidifier compatibility
  • Ultra-low continuous fan
  • Ultra-low emissions

Efficiency

  • Up to 97.5% AFUE
  • ENERGY STAR qualified

Pricing

  • Lennox furnace pricing: $2,230.00
  • Furnace installed: $3,790
  • Air and heating installation: $8,260

SL280V | Up to 80% AFUE

The SL280V’s two-stage heating calibrates based on outside temperatures. The gas furnace’s SilentComfort technology also helps it operate up to 4.5 times quieter than competing models.

Features

  • Two-stage heating
  • SilentComfort technology
  • Sound-absorbing insulation
  • SureLight Silicon Nitrade Ignitor

Technical Specs

  • Variable-speed motor
  • Insulated blower compartment
  • Enhanced humidity control
  • Air filter and humidifier compatible

Efficiency

  • Up to 80% AFUE
  • Not ENERGY STAR qualified

Pricing

  • Lennox furnace pricing: $1,990.00
  • Furnace installed: $3,150.00
  • Air and heating installation: $5,425.00

SL280NV | Up to 80% AFUE

The SL280NV is a variable-speed, ultra-low emission Lennox gas furnace. Its efficiency, and environmentally-friendly features produce 65% lower NOx emissions. Its variable-speed motor means you’ll experience consistent temperatures throughout your home while maintaining fuel efficiency.

Features

  • Two-stage heating
  • SilentComfort Technology
  • Variable-speed motor
  • SureLight Silicon Nitrade Ignitor

Technical Specs

  • Insulated blower compartment
  • Air filter compatible
  • Humidifier compatible

Efficiency 

  • Up to 80% AFUE
  • Not ENERGY STAR qualified

Pricing

  • Lennox furnace pricing: $1,990.00
  • Furnace installed: $3,150.00
  • Air and heating installation: $5,425.00

EL296V | Up to 96% AFUE

The EL296V is a Lennox gas furnace with a variable-speed, two-stage motor. Its variable-speed airflow means you won’t experience blasts of air when the system starts, and the unit gently disperses heat evenly throughout your home.

Features

  • Two-stage heating
  • Fully-insulated cabinet
  • Variable-speed motor
  • Sealed blower compartment
  • SureLight Silicon Nitrade Ignitor

Technical Specs

  • Enhanced humidity control
  • Air filter and humidifier compatibility
  • Ultra-low continuous fan

Efficiency

  • Up to 96% AFUE
  • ENERGY STAR qualified

Pricing

  • Lennox furnace pricing: $2,230.00
  • Furnace installed: $3,790.00
  • Air and heating installation: $8,260.00

Care and maintenance

Caring for your Lennox furnace involves ensuring it undergoes routine maintenance by an HVAC professional. The company also recommends the following steps. 

Clean your Lennox furnace filters

Keeping your furnace filters clean reduces excessive strain on the unit while simultaneously reducing heating costs and increasing the furnace’s lifespan. You can ensure you have an efficient return-air system by making sure the furnace’s slot has a cover. An HVAC dealer can help determine which filter is best for your furnace.

Keep your furnace clean

One of the essential things you can do regarding care and maintaining your furnace is ensuring that it stays clean. A clean furnace runs efficiently and smoothly. A professional HVAC technician should clean and inspect every part of your furnace. In between visits, vacuum all dirt and dust from your home’s registers.

What to expect during inspections

As part of your furnace’s preventative maintenance, your HVAC technician will perform the following services:

  • Inspecting furnace flames
  • Checking the flue for dents and gaps
  • Removing and cleaning the blower
  • Vacuuming all the blower cavities and burner
  • Brushing and vacuuming blower blades
  • Cleaning the sensor blade

Lennox furnace warranties

SLP98V

  • Limited lifetime warranty on heat exchanger
  • 10-year limited warranty on covered parts

SL297NV

  • Limited lifetime warranty on heat exchanger
  • Five-year limited warranty on Lennox furnace parts

SL280V

  • 20-year limited warranty on heat exchanger
  • 10-year limited warranty on Lennox furnace parts

SL280NV

  • 20-year limited warranty on heat exchanger
  • 10-year limited warranty on Lennox furnace parts

EL296V

  • Limited lifetime warranty on heat exchanger
  • Five-year limited warranty on Lennox furnace parts
  • 10-year limited extended warranty coverage with product registration

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Lennox Furnace Reviews

Showing 11-15 of 237 reviews

"My thoughts"

5.0 rating
Very Satisfied

I'm just reading through most of the reviews you guys are writing. I am a HVAC technician from Boston. Each region of the country have different demands, example those in Florida wouldn't need the same equipment that someone may need in Denver. Florida needs more Ac and dehumidifications where in Denver you would more likely need more of a heating unit with humidifiers to add moisture in the air for the winters. At the end of the day, majority of the complaints I'm reading falls back on the contractor and whether or not they took the necessary steps to provide you guys with the exact needs for you. That's when sizing of the equipment both ac and heat because you have 2 different formulas the expert needs to know. 90% of the time its not the equipment's fault something goes wrong, its whether you routinely do service or if it was properly Installed. I stand by both Lennox and Bryant. They are in my opinion the most reliable units you can invest in. I Install them in my friends and family's homes. I just wanted to add my opinion as most of the complaints I've read were from not having it properly installed or techs that don't know what they are doing.

John D

Boston, MA

"GSR21Q4/5-100 GOOD FURNACE"

4.0 rating
Somewhat Satisfied

We have had 5 of these in our building, for 20 + years now. This is a discontinued model, so its not like your going to go out and purchase one. One unit we replaced because of leaks from the condensate drain pan, and oh yeah, the motor burnt out. Another one is on the chopping block because it has multiple issues, it has become a financial sink hole, and the administration here has finally agreed to replace it. The pulse technology is kind of scattershot, no one else uses this type of ignition. Of the other three, one runs on ac/ fan all the time, for a server room, so the gas furnace is not used much if at all. Two others still work good, but sometimes they overheat and shut off for no apparent reason. Recently I repaired a condensate drain line leak at the unit. Change the filters every three months, and get it serviced once or twice a year, you should be fine. One other problem with this line is the ac coil is inaccessible, so that you can not get in to clean it. The coils should be cleaned every three months when you change the filters. I am a maintenance person writing this on behalf of the property owners.

Brian H

Washington, DC

"Very unreliable"

1.0 rating
Very Unsatisfied

I bought a Lennox g61mpv in 2006. soon after, it started leaking water all over the places. Now at about 10 years, it quit working! Inducer fan and blower both stopped working! Bad quality.

Bo Lu

Salt Lake City, UT

"Five weeks before breakfown!"

1.0 rating
Very Unsatisfied

It's a new furnace installed in May. Therefore we didn't turn it on until five weeks ago and it began to get cold. As of Sunday, it stopped working altogether. The technician tested everything and found that the motherboard was shorting out. We live in California the closest motherboard is in Texas. By the time it is delivered and installed we will have been without heat for 5 days and a home with a bone marrow transplant patient. I'm horrified that something could break down so quickly and now I'm very very suspicious about what else is going on in that unit

Safeena

San Francisco area

"Poor service"

1.0 rating
Very Unsatisfied

It's winter time and my Lennox furnace has let my family down again. Last time is was ignitor. Was informed to purchase a better quality one from Lennox. I did, and don't you build them with good ones in it? We are having furnace issues again as are a couple of my friends. My friend called for repair 2 days ago. Still nothing. I called today. I'm worried. It's -25 here. Other service people won't touch Lennox products.

Albert Bellerive

Slave Lake Alberta

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