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 26-30 of 31 reviews

"Lennox is Awesome!"

5.0 rating
Very Satisfied

Most gripes seen more centered around bad service issues and installation. SLP98V I put 1 in my home, silent operation. 100’s installed, yes bad icomforts + 1 out of 25 defective air switches. Lennox resolved, no problems since. Unfortunate that dealers don’t bother to train their staff how to troubleshoot and install properly that is the only major problem I see. Excellent engineering by Lennox on these new units.

Winnipeg, Mb, Can

"1.5 year old, Pressure switches failed, cost $400, Lennox refused to help"

1.0 rating
Very Unsatisfied

1.5 yr old, pressure switches failed, called Lennox, no backing of the failed product whatsoever, read the fine print, fixing cost over $350+half day off work – very very disappointed.

Ontario, Canada

"Lennox Furnace"

5.0 rating
Very Satisfied

We had installed lennox slp98 high efficiency furnace for 2 years and it’s very quiet furnace, it work very good condition, save a lot of money compare to my old Lennox Furnace. It’s 98% High efficiency, and it was top of rate on the market. We are very satisfied for Lennox Furnace that we have been used for 30 years.

Scarborough Ontario

"My lennox SLP98V furnace"

4.0 rating
Somewhat Satisfied

I’ve owned my furnace for about six months. It’s reliable, quiet, and works well for the most part. It gets pretty cold where I live so having a reliable furnace is important to myself and my other roommates. It’s quite efficient and my heating bill last month was as low as it’s ever been. It was reduces approximately 10% compared to our older furnace that was replaced last winter. Now that summer is here, our cooling costs have also gone down by the same 10%. It had to undergo one repair because it was not installed correctly, but this was taken care of by the people who installed it within the same week. It sometimes runs a little loudly as well, especially at night when the house is quiet. I would buy this brand again because of its great energy efficiency and overall quality, despite the few issues we had with it.

Binghamon, NY


1.0 rating
Very Unsatisfied

I had an slp98 Lennox furnace installed in Oct 2010. It’s supposed to be Lennox’s latest and greatest furnace! I was told it was 97% efficient, a big difference form my Airco which was rated at approx 60% efficient. I expected to see a huge difference on my gas bill and even called Teresan (at the time) to figure out how to change my equal monthly payments! However, I have not seen ‘any’ difference on my gas consumption. Even considering our winter. I should see some savings when there is a 37% efficiency difference, shouldn’t I?? Also, what worries me even more is that this new furnace ‘booms’ or has mini explosions periodically while ramping up to speed. The installer has guaranteed me that it is not a gas leak or seeping gas (although he has not come and to check because I have to give him a specific time when the “booms” occur) but perhaps my air ducts expanding!? Really??? Do you think I am an idiot and don’t know the difference between the two sounds? At this point I am not happy with the furnace or the service I’ve received to attend to my concerns.

Surrey BC

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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