Lennox SL280NV Ultra-Low Emissions Gas Furnace

The Lennox SL280NV Variable-Speed, Ultra-Low Emissions Gas Furnace combines innovative low-NOx technology with two-stage operation for optimal comfort and efficiency.

Category: Furnace Brand: Lennox

This furnace produces 65% lower NOx emissions than standard models, meeting strict air quality requirements. Its two-stage operation provides balanced temperatures with lower energy use. Built with heavy-duty steel for durability, it can be paired with the iComfort S30 smart thermostat for advanced connectivity and maintenance features.

The Lennox SL280NV comes with a 10-Year Limited Warranty on covered components, with options for 20-Year or Lifetime Limited Warranties on furnace heat exchangers.

About the Lennox SL280NV Ultra-Low Emissions Gas Furnace

Who this furnace is for

This Lennox gas furnace fits a defined heat-load range. Sizing isn’t done by the square footage of the home alone: a proper Manual J load calculation accounts for insulation, air sealing, window quality, basement conditioning, and ductwork. A furnace too big short-cycles and wears out faster; one too small runs flat-out on the coldest day and never quite catches up.

Why customers pick Lennox

Lennox sits at the premium end of the residential HVAC market. The brand pioneered ultra-high efficiency variable-capacity systems and has been a go-to for homeowners who value quiet operation, tighter temperature control, and longer equipment life over upfront price.

Installation notes

A furnace install involves the cabinet itself plus venting (B-vent for mid-efficiency, PVC for condensing), a condensate drain on condensing models, a properly sized gas line, a chimney liner adjustment if you’ve gone from mid- to high-efficiency, electrical, thermostat wiring, and a TSSA-permit gas safety inspection. Old equipment removal and disposal are part of the job.

Warranty and rebates

Lennox furnaces in this tier typically carry a 10-year limited parts warranty and a 20-year-to-lifetime heat exchanger warranty when registered. Enbridge Home Efficiency Rebate Plus covers high-efficiency gas furnace replacements when bundled with envelope or heat pump upgrades.

Available with professional installation by our TSSA-licensed technicians. Call (647) 558-5528 for a quote.

SEER	16
AFUE (%)	80
Stages of Heating	Two-Stage
Motor	Variable Speed
Blower Compartment	Insulated
Ignition	SureLight® Silicon Nitride Ignitor

No Returns or Exchanges: All products are final sale.
No Refunds: We do not offer refunds for any items.
Shipping Cost: Flat rate of $250 (in the Greater Toronto Area). Additional charges may apply in some areas.
Warranty: Manufacturer’s warranty applies, as outlined by the manufacturer.
Estimated Delivery Time: 4–9 business days.
Installation Service: Optional. You can choose whether you want installation.
- For the Greater Toronto Area, installation is provided by NorthWind HVAC.
- For areas outside the GTA, our partners will contact you to coordinate installation.