Lennox Furnaces

Lennox® furnaces are some of the most efficient and quietest heating systems you can buy*. They’re engineered for perfect warmth and savings.

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sl280nv Variable-speed, ultra-low emissions gas furnace
First-in-class, lowest emission furnace on the market

Fewer emissions is our mission

Along with the state of California, we’re leading the way with low-NOx initiatives and solutions. Efficient and environmentally friendly, our revolutionary design produces 65% lower NOx emissions than standard low-NOx furnaces, meeting the strictest air quality requirements. So you can feel good about your environment, inside and out. These NOx, or Nitrogen Oxide, emissions from furnaces produce ground-level ozone, which impacts the environment and your health.


Two-stage operation for more balanced temperatures

A step up from single-stage furnaces because its gas valve offers an additional lower setting. Most of the time the unit will meet heating needs at its lower stage, resulting in balanced and consistent temperatures with lower energy use. Should the low heat setting not heat the space quickly enough, the furnace will switch to the high setting. This ability to switch between the two settings offers greater comfort and efficiency.


High quality, tough and dependable

Built for durability and reliability, the SL280NV is made with a heavy-duty steel cabinet for a long, trouble-free life.


Smarter Together

When paired with the iComfort® S30 ultra smart thermostat, a world of connectivity is unlocked. It stays finely tuned to your home by using sensors to react, diagnose, and troubleshoot. It provides basic maintenance notifications and alerts, performance reports, including the ability for you to grant your dealer access to remotely diagnose and troubleshoot. This pro-active and responsive HVAC care is valid for the lifetime of the HVAC system. Promising peace of mind by doing away with unnecessary dealer visits, avoiding potential repair costs, and ensuring nothing short of perfect air. Of course, you can also use your iComfort S30 or the Lennox app to schedule and set away modes, adjust and maintain temperatures, ensure ideal humidity levels, optimize comfort in your home’s zones, and more.