PremiStar Acquires Johansen & Anderson

PremiStar, LLC Acquires Armistead Mechanical, Inc.

April 22, 2026

HVAC & Mechanical

PremiStar, LLC acquired Armistead Mechanical, Inc., expanding PremiStar’s commercial HVAC, plumbing, and building automation footprint into New Jersey and the Hudson Valley region of New York. PKF Investment Banking served as the exclusive financial advisor to Armistead Mechanical in the transaction.

PremiStar Acquires Smith's Refrigeration

October 21, 2025

HVAC & Mechanical

PremiStar announced that Smith's Refrigeration, a full-service mechanical contractor based in Lumberton, North Carolina, has joined the PremiStar family of companies. The acquisition expands PremiStar’s HVAC, refrigeration and mechanical capabilities in North Carolina and South Carolina and strengthens its service coverage across healthcare, senior living, education, manufacturing and government end markets.

PremiStar Acquires HVAC Services Division of Dahme Mechanical

March 4, 2025

Industrial Services

PremiStar has acquired the HVAC services division of Dahme Mechanical Industries, Inc., based in Countryside, Illinois. The deal moves the division's employees and commercial HVAC customers into PremiStar’s Frankfort, IL operations and expands PremiStar’s service capabilities in northern Illinois and northwest Indiana.

PremiStar Acquires Conditioned Air Design

November 13, 2024

HVAC & Mechanical

PremiStar has acquired Conditioned Air Design, a commercial HVAC contractor based in West Allis, Wisconsin, expanding PremiStar's footprint in Southeastern Wisconsin. The deal strengthens PremiStar's service capacity for education, healthcare, commercial/industrial, and data center customers and provides career opportunities for Conditioned Air Design's employees.

PremiStar Acquires SI Mechanical

June 12, 2024

HVAC & Mechanical

PremiStar, a commercial and industrial HVAC, plumbing, and building automation platform, has acquired SI Mechanical, LLC, a full-service HVAC and plumbing contractor based in Creedmoor (Austin), Texas. The deal expands PremiStar's footprint in central Texas and brings SI Mechanical's local leadership and customer base (education, healthcare, commercial/industrial, and datacenters) into the PremiStar platform.

PremiStar Acquires Mercury Mechanical

February 15, 2024

HVAC & Mechanical

PremiStar, a PE-backed commercial HVAC, plumbing and building automation platform, has acquired Mercury Mechanical, a full-service HVAC, sheet metal and piping contractor based in Northlake, Illinois. The acquisition expands PremiStar’s footprint in the Chicagoland area, Illinois and southern Wisconsin and brings Mercury Mechanical’s commercial, industrial and healthcare customers into PremiStar’s platform.