Dallas, November 2, 2026 / PRNewswire / -- Lennox (New York Stock Exchange ticker: LII), a leader in energy-efficient building and home comfort solutions, announced today that Joe Nassab, Executive Vice President and President of Building Climate Solutions, will step down from his current position by the end of 2026 and will continue to provide support to Lennox in the role of strategic advisor. Geoff Dethlefsen, currently Vice President and General Manager, will take over leadership of the Building Climate Solutions business starting January 1, 2027.
Lennox CEO Alok Maskara stated: " Joe has made a profound impact in Lennox through his leadership, industry expertise, and consistent dedication to customers and employees. I am delighted that Lennox will continue to benefit from Joe's leadership and extensive industry experience in the future. In his new role, Joe will focus on supporting the building climate solutions business unit and guiding and nurturing our general managers as well as the next generation of leaders."
Nassab joined Lennox in 2010, serving as the Vice President and General Manager of Allied Air. In 2022, he was appointed to lead the North American Commercial Heating and Cooling business unit, which was later renamed Building Climate Solutions. During his tenure, Nassab helped to transform Building Climate Solutions into a broader platform for commercial equipment and services. This business unit expanded its capabilities through acquisitions of AES, as well as investments in manufacturing, distribution, and customer experience.
Nassab It is a great honor for me to be able to work side by side with the talented members of each team at Lennox. I am proud of the achievements we have made, and I believe that Geoff and the Building Climate Solutions team will continue to drive the business forward and bring results to our customers.
Lennox indicates that the building climate solutions business will continue to build on the momentum established under the leadership of Joe, while also driving the growth strategy, operational excellence, and differentiated customer value of this business segment. Maskara states: "Since joining Lennox, Geoff has delivered strong performance. Under his leadership, Lennox Commercial HVAC has achieved revenue and profit margin growth, improved operations, and launched a new manufacturing plant in Saltillo (Saltillo). His track record in business execution, operational leadership, and prudent capacity expansion makes him well-suited to continue accelerating the growth of the building climate solutions business and expanding profit margins."
Dethlefsen joined Lennox in 2024 and possesses over 20 years of experience in industrial manufacturing, strategy, and business operations leadership. Before joining Lennox, he served as the President of Hammerforce USA as well as the President of the Professional Grade Trailers department under American Trailer World. He has also held leadership positions at Flowserve Corporation and Bain & Company. Dethlefsen holds a Bachelor's degree in Mechanical Engineering from Rice University and a degree from the University of Texas at Austin's MBA program.
Dethlefsen represents: "I am honored to lead the Building Climate Solutions business and to build upon the solid foundation laid by Joe and the team. We will continue to focus on serving our customers, strengthening our execution capabilities, and seizing the tremendous growth opportunities ahead of us."
About Lennox
Lennox (New York Stock Exchange ticker: LII) is a leader in the field of energy-efficient building solutions, dedicated to creating healthier and more comfortable environments. The company serves residential and commercial customers, providing innovative heating, cooling, indoor air quality, refrigeration, and hot water systems. With reliable products, components, and services, as well as advanced technology, Lennox offers interconnected solutions that meet the needs of customers throughout their entire lifecycle. For more information, please visit www.lennox.com.
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