ACCO Engineered Systems

ACCO Engineered Systems is an employee-owned mechanical contractor based in Pasadena, California, founded in 1934. It is recognized as one of the largest contractors in the western United States, specializing in the design, fabrication, installation, maintenance, and service of mechanical systems. These include HVAC, refrigeration, plumbing, process piping, electrical, and building automation systems. The company offers a full range of services that cover the entire lifecycle of mechanical systems, from engineering and fabrication to installation and long-term maintenance. ACCO is committed to delivering customized, cost-effective solutions with a focus on quality and project management. It serves a diverse array of industries, including healthcare, education, manufacturing, and commercial real estate, with a client base of over 8,000 accounts across multiple states and Mexico. With more than 5,000 employees and over 40 offices, ACCO Engineered Systems generates annual revenues around $1.5 billion and is consistently ranked among the top HVAC contractors in the nation. The company emphasizes long-term reliability and energy efficiency in its systems, ensuring customer satisfaction through integrated engineering and maintenance services.