Therma Holdings Acquires Bel-Aire Mechanical

PremiStar Acquires Air Temp Mechanical (CT)

January 21, 2025

HVAC & Mechanical

PremiStar has partnered with Air Temp Mechanical, Connecticut’s largest independent commercial HVAC contractor, adding the 188-employee company to its national platform and expanding PremiStar’s footprint to 16 states. Air Temp Mechanical (founded 2001, led by Jeff Leone) provides HVAC installation, maintenance, building controls, plumbing and sheet metal fabrication to education, commercial/industrial, healthcare and government customers.

Therma Holdings Acquires CMTA and Building Systems Holdings to Expand Energy & Sustainability Platform

July 16, 2021

Engineering Services

Therma Holdings, a Blackstone portfolio company, agreed to acquire CMTA and Building Systems Holdings (BSH) to expand its engineering and energy services platform for high-performance buildings across the United States. The add-on acquisitions bring expanded MEP/energy-efficiency engineering, performance contracting, and construction management capabilities—adding over 150 professional engineers and broadening end-market coverage in healthcare, K‑12, higher education, federal and municipal facilities.

Blackstone Energy Partners Acquires Therma Holdings (and RE Tech Advisors) from Gemspring Capital

November 9, 2020

Engineering Services

Private equity funds managed by Blackstone Energy Partners have entered into a definitive agreement to acquire Therma Holdings LLC, a specialty mechanical, electrical and controls services provider, from Gemspring Capital. Blackstone is also acquiring RE Tech Advisors, Inc. and will integrate it into Therma to expand energy efficiency, sustainability and building management capabilities; the combined business will support mission-critical facilities across technology, life sciences, healthcare and data center end markets.

Therma Holdings Acquires Gilbert LLC

June 8, 2020

Industrial Services

Therma Holdings, a Gemspring Capital portfolio company, has acquired Gilbert LLC, a Minneapolis-area provider of mechanical, electrical, plumbing, controls and fire protection services. The deal is Therma's fourth add-on since partnering with Gemspring and is intended to expand Therma's capabilities and presence in the Twin Cities market, particularly for mission-critical facilities such as healthcare.

Therma Holdings Acquires Integrated Mechanical Systems

February 25, 2019

Industrial Services

Therma Holdings LLC, a portfolio company of Gemspring Capital, has acquired the assets of Integrated Mechanical Systems, an Irwindale, California-based provider of mechanical design, fabrication, construction and maintenance services. The acquisition is intended to accelerate Therma's service offering and scale in Southern California by combining Integrated Mechanical into Therma's existing Southern California operations.

Therma Holdings Acquires Yearout Mechanical

January 15, 2019

HVAC & Mechanical

Therma Holdings LLC, a Gemspring Capital-backed Bay Area mechanical services platform, has acquired Yearout Mechanical, a design-build HVAC, plumbing and piping services provider based in Albuquerque, New Mexico. The acquisition expands Therma's geographic footprint into the New Mexico market and adds in-house fabrication and design-build capabilities to its platform.