Climate-control systems manufacturer Lennox agreed to acquire the HVAC division of NSI Industries from Sentinel Capital Partners for $550 million.

Based in North Carolina, NSI Industries’ HVAC platform includes brands such as Duro Dyne and Supco, which offer components and accessories used by HVAC technicians and fabricators. The product lines complement Lennox’s existing residential and commercial HVAC offerings, with manufacturing and distribution across the U.S. and Canada. Duro Dyne manufactures HVAC/R components and accessories, while Supco supplies technician-focused HVAC/R parts.

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Texas-based Lennox provides energy-efficient climate control systems for residential and commercial use, including cooling, heating, indoor air quality and refrigeration products. The company focuses on reducing environmental impact through sustainable solutions.

“By adding trusted heritage brands including Duro Dyne and Supco into our portfolio, we are responding to the needs of our customers who have asked for a broader parts and supplies offering,” Lennox CEO Alok Maskara said in an Aug. 18 news release. “As a company, Lennox just celebrated 130 years of HVAC innovation, and I look forward to welcoming the new employees from this acquisition as we come together to further transform the North American HVAC industry.”

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Lennox said the acquisition strengthens its ability to offer a broader, more integrated range of parts and supplies, supported by improved digital and distribution capabilities across North America.