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  • Construction Services
    Solutions & Services

    Construction Services

    ​Whether it’s a school, a mall, an office tower, a hospital, a hotel, a museum or a manufacturing plant, our extensive experience in new construction makes us prepared for the challenge of your project. We’ll give you energy advocacy and quality assurance all through your Design-Build or Plan-and-Spec process – selecting quality products, an experienced contractor team, cost-effective service options and…

  • Preconstruction
    Solutions & Services


    Before construction even starts, you’ll benefit from our proactive approach

  • Retrofit & Replacement
    Solutions & Services

    Retrofit & Replacement

    ​Start-to-finish solutions for all renovation and retrofit projects

  • BIM
    Solutions & Services


    Saving our customers time and cutting costs with BIM

  • Careers


    ​Join our team of experienced professionals and a growing, reputable company

Welcome to Hess Mechanical, LLC

Hess Mechanical has been providing innovative mechanical solutions in the Washington, DC area since 1980. We specialize in commercial and industrial construction in both Plan Specification and Design-Assist projects. With a dedicated safety program, safety manager, highly qualified superintendents, foremen, mechanics, and project managers, as well as a full service HVAC and Plumbing shop, we can meet all of your building automation, mechanical service, and mechanical construction needs.

Having joined with Comfort Systems USA in 1998, we have become part of America’s leader in installation and service for building mechanical systems. Over the years, Comfort Systems USA has merged with the best regional experts and now provides a nationwide reach through 96 subsidiary companies that are prepared to build, service, or retrofit any mechanical, HVAC, or electrical system.

No other company offers a wider range of technical expertise and experience.  And our foundation of uncompromising integrity, unequaled service, and effective project management make us the value leader in this market.

We invite you to learn more about us, and explore the comprehensive menu of capabilities we offer our customers.  And then engage with us – you’ll discover quickly why our customers keep coming back to us to create mechanical systems solutions of real quality and value.