slp99v
Variable-Capacity Gas Furnace
The quietest and most efficient furnace you can buy
ENERGY STAR® Qualified
For eligible Dave Lennox Signature® Collection series models, homeowners have the opportunity to obtain the default 5‑year parts‑only extension (for a total of 10 years parts‑only coverage) or, in lieu of that option, they have the opportunity to receive 3 years of labor coverage and 2 years of parts coverage (for a total of 3 years labor coverage and 7 years parts coverage). Other terms, conditions, and exclusions apply.
For more information, visit www.lennox.com/warrantyyourway
Heating Savings
Features
The Ultimate Side of Perfect Air
Not only is the SLP99V gas furnace part of the Dave Lennox Signature® Collection, it’s part of the Ultimate Comfort System™. Which combines the best of everything Lennox has to offer to create an unprecedented whole-home comfort system that seamlessly and intelligently works together to stay finely tuned to your home and deliver consistently clean, perfect air.
Consistently Perfect
Consistently Perfect
Smarter Together
With the help of the Lennox S40 Smart Thermostat ultra smart thermostat, the SLP99V gas furnace unlocks a world of connectivity. It stays finely tuned to your home by using sensors to react, diagnose, and troubleshoot—all while remaining in constant contact with your dealer to ensure proactive responses. Geofencing technology ensures your air turns on and off as you come and go. And the system even responds to the outdoor environment to adjust operation to account for factors like pollen and outdoor air quality.
Beyond Quiet
Even with all of its impressive power, this furnace is the quietest you can buy and has been engineered to run at variable speed to drastically minimize the sound of air kicking on or off inside the home.
Ratings & Reviews
See what other customers are saying about
SLP99V Variable-Capacity Gas Furnace
4/5
5/5
Lennox Flag-Ship Models; Trouble Free
October 18, 2026The Lennox SLP99VK furnace is excellent and working as expected. It operates so quietly and warms the home very quickly. I am pleased with it. On the A/C side, the EL22KCV unit also works perfectly. During the September Heat Wave season, it kept my home comfortable and it runs very quietly. The variable speed operation kept my home at an even temperature without hot/cold spots. I am running a two zone system and both zones operate on two (non-Lennox) Smart thermostats. Runs perfectly now after the technicians returned twice to address an issue of leaking A/C and Heat from one zone into the other zone. In my prior home I had the two Lennox XC systems installed in 2015. Those systems performed for for eleven years with no issues. I would recommend Lennox A/C and Heating systems based on my experience with Lennox for the last eleven years.
5/5
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Products that add to the performance of SLP99V Variable-Capacity Gas Furnace
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- * Furnace model numbers designated with a ‘K’ (SLP99VK) indicate the equipment contains an on board refrigerant detection system. Identical furnace model numbers without a ‘K’ (as shown above) indicate an identical product as to key aspects of the equipment, including rating, performance, and specifications, but specifically exclude an on board refrigerant detection system.
Proper sizing and installation of equipment is critical to achieve optimal performance. Split system air conditioners and heat pumps (excluding ductless systems) must be matched with appropriate coil components to meet ENERGY STAR criteria. Ask your contractor for details or visit www.energystar.gov.
