1895

Dave Lennox builds and markets the industry’s first riveted-steel furnace.

1904

Lennox establishes a one-step distribution network, selling directly to installing contractors.

1923

Lennox expands for the first time, building a warehouse in Syracuse, New York. Two years later a factory is added.

1935

Lennox pioneers the introduction of a forced-air furnace for residential heating.

[1895–1930s] [40s–60s] [70s–80s] [90s] [2000–present]

1943

Lennox retools its factories to support the World War II effort.

1952

Lennox establishes operations in Canada.

Lennox expands its product line with the introduction of residential central air-conditioning systems.

1960

Lennox establishes an international division with a facility in Basingstoke, England and sales offices and warehouses in Holland and Germany.

1964

Lennox develops and manufactures the Duracurve heat exchanger, reducing noise problems in gas furnaces.

1965

Lennox introduces packaged multi-zone units for commercial heating and cooling.

[1895–1930s] [40s–60s] [70s–80s] [90s] [2000–present]

1972

“Dave Lennox” appears for the first time in a Lennox advertising campaign.

1973

Lennox increases air conditioning efficiency with the development of the two-speed hermetic compressor.

1982

Lennox develops and manufactures the industry’s first high-efficiency gas furnace.

1984

Lennox International Inc. is established as the parent company for Lennox Industries Inc. and future acquisitions.

1986

Lennox International expands into the commercial refrigeration and heat transfer markets with the establishment of Heatcraft Inc.

1988

Lennox International expands into two-step distribution of residential heating and cooling equipment with the acquisition of Armstrong Air Conditioning Inc.

Heatcraft implements a 48-hour coil replacement program for commercial air conditioning systems.
 

[1895–1930s] [40s–60s] [70s–80s] [90s] [2000–present]

1994

Lennox is the first to manufacture and market a complete combination high-efficiency residential space/water heating system.

Lennox enters the hearth products market with the introduction of gas fireplaces.

1995

Lennox Global Ltd. (LGL) is established to expand the company’s presence in worldwide commercial air conditioning, commercial refrigeration and heat transfer product markets.

Heatcraft develops Floating Tube and Thermoflex technology, significantly reducing leaks in air-cooled condensers and unit coolers used for commercial refrigeration.

Lennox begins factory configure-to-order for commercial air conditioning with the introduction of the L-series.

1996

The Beacon Control System eases installation and maintenance of refrigeration system problems.

1997

LGL enters into joint venture agreements in Europe and Latin America and makes acquisitions in Asia.

1998

Lennox Industries begins to establish a retail distribution network offering full sales and service functions.

1999

Lennox International completes an Initial Public Offering becoming a public company on July 28, 1999.

[1895–1930s] [40s–60s] [70s–80s] [90s] [2000–present]

2002

LII launches new corporate logo to reflect worldwide growth

2003

LII introduces HSX19, industry's quietest and most efficient air conditioner

LII introduces G61V, industry's quietest gas furnace

2005

Lennox announces refinements to historic Lennox brand logo design 

Lennox introduces world’s first air conditioner rated at 20+ SEER for energy efficiency

2006

First fully integrated whole-house dehumidification system

2007

First comprehensive line of ozone-free residential indoor air quality products

2008

Lennox introduces SunSource™, the industry's first integrated solar-assisted residential heating & cooling system

[1895–1930s] [40s–60s] [70s–80s] [90s] [2000–present]