Sentinel Capital Partners Sells NSI Industries' HVAC Division to Lennox for $550 Million

Divestiture Returns NSI to Pure-Play Electrical Products Business

NEW YORK, Oct. 16, 2025 /PRNewswire/ -- Sentinel Capital Partners, a private equity firm that invests in promising midmarket companies, today announced the sale of NSI Industries' HVAC division—which includes the market-leading Duro Dyne and Supco brands—to Lennox International for approximately $550 million in cash.

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