HSI Mechanical, Inc.

HSI Mechanical, Inc., founded in 1974 as a subsidiary of Pacific Marine & Supply Company, is a Hawaii-based HVAC mechanical contractor serving commercial and government clients. With roots going back to 1944 and over 50 years of mechanical expertise, HSI has built a strong reputation as a leader in energy-efficient building automation systems. We’ve installed and maintained systems for major clients across healthcare, hospitality, retail, education, and military sectors throughout Hawaii. Energy efficiency, community engagement, and superior service are central to our mission. As proud signatories of Local 675 and Local 293, our team of experienced tradespeople ensures consistent performance and trusted expertise. We remain committed to supporting Hawaii through both our work and our active involvement in local organizations.