ACCO Engineered Systems Email Format

ConstructionCalifornia, United States1001-5000 Employees

ACCO Engineered Systems designs, installs, and maintains mechanical systems for commercial and industrial projects, including HVAC, refrigeration, plumbing, process piping, and building automation. The company provides in-house engineering, fabrication, installation, commissioning, and ongoing service, delivering integrated solutions that address both mechanical and control system needs. This turnkey model coordinates design, fabrication, installation, commissioning, and ongoing service under a single delivery system.

Founded in 1934 and based in Pasadena, California, ACCO has grown into a major mechanical contractor serving California and the Southwest. It operates as a private, employee-owned ESOP and has expanded its capabilities through affiliations with Sunbelt Controls, Sunbelt Electric, Smith MEP, Geo. H. Wilson, PLS Companies, and AES Industrial, while also broadening its footprint with a Pleasanton, California office opened in 2025.

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