Lennox International Acquires NSI Industries' HVAC Division (Duro Dyne & Supco)

Lennox International Acquires Heat Controller

June 18, 2026

Industrial Services

Lennox International has signed a definitive agreement to acquire Heat Controller, an HVAC equipment supplier that serves distributors across North America through the Comfort-Aire and Century brands. The acquisition is expected to expand Lennox’s ability to serve small and mid-size HVAC distributors and broaden access to differentiated equipment offerings, with closing expected later in 2026 subject to customary conditions and regulatory approvals.

Hubbell Incorporated Acquires NSI Industries for $3 Billion

May 6, 2026

Industrial Services

Hubbell Incorporated agreed to acquire NSI Industries for approximately $3.0 billion in cash to expand its Electrical Solutions portfolio. The deal is expected to close in mid-2026, subject to customary regulatory approvals.

Johnstone Supply Acquires Dunphey-Smith Supply

February 12, 2026

Industrial Services

Johnstone Supply acquired Dunphey-Smith Supply, an HVAC parts and equipment distributor with New Jersey locations in Union and Manasquan. The tuck-in acquisition adds two “Garden State” locations and is intended to improve product availability, deepen technical expertise, and better serve HVACR customers.

Sentinel Capital Partners Acquires NSI Industries

November 18, 2024

Manufacturing

Sentinel Capital Partners has acquired NSI Industries, a Huntersville, North Carolina-based manufacturer and supplier of branded electrical and HVAC components, from Odyssey Investment Partners. Financial terms were not disclosed; Sentinel says the transaction creates a new platform that builds on the firm's experience in branded electrical products and aims to support NSI's continued growth across distribution and manufacturing capabilities.

NSI Industries Acquires Lynn Electronics

June 20, 2022

Telecommunications

NSI Industries, a provider of electrical, HVAC and network infrastructure product solutions, has acquired Lynn Electronics, a manufacturer of custom fiber optic and copper assemblies based in Ivyland, Pennsylvania. The purchase expands NSI's network infrastructure/catalog connectivity offerings and strengthens its position in the data center, broadband and AV markets.

NSI Industries Acquires Duro Dyne Corp.

November 19, 2021

Building Products

NSI Industries, a Huntsville-based electrical products distributor, has acquired Duro Dyne Corp., a Bay Shore, New York sheet metal manufacturer serving the HVAC industry. The acquisition adds the HVAC market and sheet metal accessory manufacturing capabilities to NSI's distribution platform; terms were not disclosed.