Lennox SLP98V Furnaces | FurnaceCompare®

Lennox SLP98V Furnace Overview

The Lennox SLP98V is a gas variable-capacity furnace with an efficiency rating of up to 98.7% AFUE. The SLP98V comes equipped with a self-calibrating variable speed inducer and a stainless steel secondary heat exchanger. It has dual-fuel capability, meaning it can be paired with a heat pump to provide increased comfort and efficiency. The variable-speed motor and advanced sound absorbing materials provide quiet performance. This furnace has earned the Energy Star Most Efficient 2015 label, which means it is both extremely efficient and prevents greenhouse gas emissions. When paired with an iComfort Wi-Fi thermostat, the SLP98V provides advanced scheduling and remote access via laptop, smartphone or tablet.

Furnace Filters for the Lennox SLP98V

Air Flow ConfigurationCabinet WidthFilter Size(s)
Upflow / HorizontalAll16x25x1 (side)
16x25x1 (bottom)

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Consumer Reviews of Lennox SLP98V


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #6 of 29 Lennox Furnace
  • 51.61% of customers recommended

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Lennox SLP98V Furnace Reviews

Showing 16-20 of 31 reviews


5.0 rating
Very Satisfied

This unit was installed in Oct. 2013, so there is not much info to go on. It performed as expected during this winter’s very cold weather. I have not been able to determine how efficient it was compared to my old furnace, which was 25 years old. I am hoping that with the dual-fuel rate for electricity, that it will be more economical in the long run.

Freeport, MN

"Avoid at all costs"

1.0 rating
Very Unsatisfied

Stay away from Lennox SLP98UH110xv60c-03 unless you want to be woken up in winter with a high pitch noise throughout the house. Dealer checked on it and said, everything is alright, nothing they can do. Furnace is less than 2 years old. Very frustrated! Followed up with Lennox directly, 2 months later, no reply. $4,000 wasted on a piece of crap!

Toronto, Canada

"The best furnace ever"

5.0 rating
Very Satisfied

We have a 2,800 sq-ft two story house in Michigan. We built this house in 1992 with a reputable builder. He installed a Carrier Weather maker 100k btu furnace 90% and a 4-tom a/C. The furnace has worked fine and four years ago, we replaced the high temp sensor and then this x-mas the gas valve (on Jan. 1, 2014). However, all these years our house had temp difference of anywhere between 2 to 5 degrees between upstairs and downstairs – hot in summers and cold in winters. Also, the furnace would make a rather loud noise when it would kick on you could certainly hear the blower even though I sleep upstairs, it kept waking me up in the middle of the night. Since the unit was 22 years old and it kept making so much noise, I decided to shop around for a new high eff furnace. I read all of these reviews on this site and got estimates for Trane, Carrier, Lennox, and Bryant. At the end, I went with the slp98v and xc- 18 ac with icomfort. The furnace was installed three days ago. This furnace is simply outstanding. First, I cannot even hear it when it turns on because of the var-speed blower – it is absolutely quiet when in normal mode. Second, we no longer have temperature difference between upstairs and downstairs. I am not making this up – the furnace produces very consistent heat in every part of the house. Third, we had a central humidifier (Honeywell) which I kept. But, the installer took out the humidity sensor that came with Honeywell and just hooked up the wires to the furnace since it has its own internal humidity sensor. We can actually control the humidity from the thermostat now and I do not have to go to the basement each time I want to change the humidity. Fourth, the t-stat (iComfort) has tons of very useful features not to mention I connected it to the internet and I can control it via my iphone. Fifth, this unit is 98% efficient which in mi qualifies for close to $500 rebate from the utility company. Also, Lennox was running a special and we will get a huge rebate for this unit. Lastly, we used Terry Allen to purchase and install the unit and they offer 5 years labor and 2 years free maintenance to go with the 10-year parts warranty of this unit. So far so good and I love this unit. I will certainly let people know if something should happen. The only minor concern is the price – but we were looking for something high end with variable speed and communicating system and when compared with the other units we considered, this package came out much better.

Grand Blanc, Michigan


1.0 rating
Very Unsatisfied

23 month old unit stopped working during 2014 Polar Vortex. Pressure switch failed. 5 days to get new part installed. $250 out of pocket expense. Have read about others with same problem with this unit.

Leesburg, VA

"I finally pulled it out"

1.0 rating
Very Unsatisfied

The Lennox slp98 that I purchased 3 years ago is now pulled out and replaced with a different model. It never worked properly from day 1. It took them at least 2 weeks to get it operating more than a hour at a time. Afterward, it would just shut-down once or twice a week for an hour or so or sometimes never come on again until a service tech got it running again. I had two portable heaters on stand-by all the time. The last month with a different reliable furnace has been a blessing. It can get to -40C where I live.

Winnipeg Canada

Other SLP98V Reviews

A consumer consults hvac-talk.com about choosing between a Lennox SLP98V, a Coleman unit and a Rheem furnace. He has received quotes on each of these furnaces. One contractor recommends the Rheem product; the other comments seem favorable toward the Lennox furnace based on the ease of servicing, small footprint and positive feedback from customers.

A homeowner asks for comparison between an Amana furnace and the Lennox SLP98V, as he is considering which one to install. An expert replies that Lennox is a more reliable brand, in his experience, and bases his recommendation upon that.

Another question is posed about the Lennox SLP98V on justanswer.com. An HVAC expert discusses that it is a modulating furnace, which is more expensive than a regular furnace but generally provides more comfort. The expert feels that Rheem offers a superior modulating furnace, but there are no negatives associated with the Lennox product. Overall, the feedback on the forums seems to relate that the Lennox SLP98V is a worthwhile furnace to own.

Question and Answer


New Lennox SLP98v unit is flashing the code A375. Any idea what that means?


According to the Installation Manual for the Lennox SLP98v the diagnostic code of “A” is displaying the Cubic feet per minute (cfm) setting for indoor blower (1 second ON, 0.5 second OFF) / cfm setting for current mode displayed.

Lennox SLP98V Model Numbers

The SLP98V is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
SLP98DF070V36B-* 97.5 66,000
SLP98DF090V36C-* 97.5 88,000
SLP98DF090V48C-* 97.5 88,000
SLP98DF090V60C-* 97.5 88,000
SLP98DF110V60C-* 98.2 110,000
SLP98UH070V36B-* 97 66,000
SLP98UH090V36C-* 98 88,000
SLP98UH090V48C-* 97.5 88,000
SLP98UH090V60C-* 98.2 88,000
SLP98UH110V60C-* 97.5 110,000

SLP98V Warranty

Lennox provides a lifetime limited warranty on the heat exchanger of the Lennox SLP98V. Parts are covered by a 10-year limited warranty. An extended warranty is also available for purchase at the time of installation.

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