Harvest Partners, LP announced July 1 that funds it manages have completed the Integra Testing Services acquisition, taking control from Keystone Capital Management, LP. The deal hands the New York-based private equity firm one of the country's largest independent providers of certified testing, adjusting and balancing services for commercial HVAC systems, along with a related controlled-environment testing and certification business.
A Platform Built on TAB and Controlled-Environment Testing
Integra provides commercial HVAC testing, adjusting and balancing services — commonly referred to in the industry as TAB — alongside controlled-environment, or CE, testing and certification for a range of high-criticality end markets. By combining both capabilities under one platform, the company offers what it describes as a turnkey solution for complex facilities where testing failures and downtime carry outsized costs, including life sciences, healthcare, education, government and data center facilities.
Integra's services include cleanroom certification, fume hood testing, pharmacy compliance testing, duct leakage testing, air barrier testing and commissioning services. The company employs more than 600 professionals across 30 office locations in the United States, Mexico and Guam.
Management Team Stays in Place
Integra's existing management team, led by Chief Executive Officer Dominic Mazzolini, will continue to lead the company and remain significant owners of the business following the transaction. Terms of the deal were not disclosed.
"Harvest's growth orientation, experience, and enthusiasm for Integra will be invaluable as we continue to provide the highest quality services to our existing and new built environment customers," Mazzolini said. "The Integra leadership team looks forward to a fruitful partnership with Harvest."
Why Harvest Partners Sees an Opportunity
Harvest, founded in 1981 and managing more than $20 billion in assets as of March 31, 2026, invests in middle-market service businesses across business services and industrials, commercial services, consumer services and healthcare services. The firm framed the Integra investment as sitting at the intersection of several long-standing focus areas, including specialty testing, infrastructure services and outsourced services into life sciences and healthcare.
"We are thrilled to partner with Dom and the entire Integra team," said Stephen Fessler, a partner at Harvest. "Integra has built a leading national platform providing mission-critical TAB and CE services to customers operating complex facilities. We believe the Company is exceptionally well-positioned to continue expanding its capabilities and supporting customers across a variety of high-criticality end-markets." Shane McHugh, a principal at Harvest, added that the firm looks forward to supporting Integra's next phase of growth "both organically and through strategic acquisitions that broaden the Company's service offerings and geographic reach."
Specialty Testing Draws Steady Private Equity Interest
Businesses built around mandatory, code-driven or accreditation-driven testing services have become a recurring target for private equity investors because demand is largely insulated from broader construction cycles — buildings that already exist still require periodic recertification, and new facilities in regulated sectors such as life sciences and healthcare cannot open without passing commissioning and testing requirements. That combination of recurring, non-discretionary revenue and technical barriers to entry has made TAB and CE testing platforms attractive consolidation targets even during periods when new construction activity slows.
Advisors on the Transaction
Harris Williams and Baird served as financial advisors, and DLA Piper served as legal advisor, to Integra and Keystone Capital on the deal. Houlihan Lokey, Jefferies and Solomon Partners served as financial advisors, and Kirkland & Ellis served as legal advisor, to Harvest. Keystone, founded in 1994 and managing more than $1 billion in capital commitments across two funds, has completed more than 50 platform investments and over 200 total acquisitions since its founding, with a focus that includes commercial and industrial services, industrial technology and technical services — the category into which Integra fell during Keystone's ownership.
A Sign of Continued Deal Flow in Commercial HVAC Services
The Integra transaction adds to a steady stream of private equity activity touching the commercial side of the HVAC industry, distinct from the residential service roll-ups that have dominated headlines in recent years. Where much of that residential consolidation has centered on installation and repair contractors, deals like Harvest's acquisition of Integra reflect investor interest in the specialized compliance, testing and verification services that sit alongside — rather than in direct competition with — the equipment installers and mechanical contractors who make up the bulk of the commercial HVAC workforce.
