Lennox International Inc.

Lennox International Inc. (NYSE: LII) is a public company founded in 1895 that specializes in climate control solutions. Headquartered in Richardson, Texas, the company designs, manufactures, and markets a range of heating, ventilation, air conditioning, and refrigeration (HVACR) products. For the fiscal year ending in 2025, Lennox reported revenues of approximately $5.2 billion. As of early 2026, the company employed between 12,900 and 14,200 people.

Lennox operates through two primary business segments: Home Comfort Solutions and Building Climate Solutions. The company's product lines include furnaces, air conditioners, heat pumps, packaged heating and cooling systems, and indoor air quality equipment for the residential market. For commercial clients, Lennox provides unitary heating and air conditioning equipment, applied systems, controls, and refrigeration products under brands such as Lennox, Allied Air, Heatcraft, and Armstrong Air. The company serves both the new construction and replacement markets in North America.

As an operating company, Lennox International's patent litigation history consists of defending its own technology. The company is tracked as a defendant in one patent case and has not been a plaintiff. This posture is typical for a manufacturing company focused on product development and sales rather than patent assertion.

The single tracked case is Portus Singapore Pte Ltd et al. v. Lennox International Inc., filed on April 23, 2026, in the U.S. District Court for the Northern District of Texas. This case represents a typical scenario where a large technology manufacturer is targeted by a patent assertion entity.