The merger between Affiliated Distributors and The Commonwealth Group, two of the largest member-owned buying groups serving the plumbing, HVAC, and waterworks distribution channel, became operationally effective on January 1, 2026, bringing together 349 independently owned PHCP distributors with combined total company sales exceeding $40 billion. With the integration now well underway, the practical effects of the merger are becoming clearer for the distributors and manufacturers operating within it.
What changed structurally: The combined PHCP business unit now spans AD's existing divisions for plumbing, HVAC, PVF, and decorative brands, plus The Commonwealth Group's waterworks division. Leadership transitioned with TCG president Mike Lepley taking over the combined PHCP business unit, succeeding Jeffrey Beall, who led AD's PHCP operations for 14 years and is serving as senior advisor through the transition before departing in 2026. AD's U.S. Plumbing and HVAC divisional boards and vendor committees were reconstituted to provide equal representation between the two legacy organizations.
Why scale matters in a buying group structure: Buying groups like AD function by aggregating purchasing volume across independently owned member distributors to negotiate better pricing, rebates, and terms with manufacturers than any single distributor could achieve alone. A combined organization representing 349 PHCP distributors and over $40 billion in sales has materially more negotiating leverage with HVAC OEMs than either organization had independently — a dynamic that flows through to the pricing and terms available to member distributors, and ultimately to the contractors who buy from them.
What it means for HVAC manufacturers selling through the channel: OEMs that sell through AD and TCG member distributors are now negotiating with a single, larger vendor committee structure rather than two separate buying group relationships. TCG's stated rationale — described by board chairman Colin Perry as being about modernizing how independent distributors operate, not just about scale — points toward an integration focus on shared technology platforms and digital tools that could improve inventory visibility and order response times across the combined network.
What it means for contractors buying from AD or TCG member distributors: The most direct effect for contractors is generally invisible at the point of sale — pricing and product availability flow through the same local distributor relationships contractors already have. The structural benefit shows up indirectly, through improved purchasing terms that allow member distributors to remain price-competitive against larger national chains and PE-backed distribution platforms, a competitive pressure that has intensified across the wholesale distribution sector throughout 2025 and 2026.
The competitive context: This merger reflects the same consolidation logic playing out across HVAC services and equipment manufacturing — scale advantages compounding in a market where private equity-backed platforms and national chains are competing aggressively for market share. For independent distributors who are members of AD or TCG, the combined buying group is a defensive consolidation move, allowing independently owned businesses to access negotiating leverage and technology investment that would otherwise only be available to much larger, often PE-backed competitors.
