Mechanical System Design Services


SEG provides design services for mechanical systems including:


  • Building HVAC, including dry-side and wet-side systems, and controls
  • Central energy plants, including chilled water, heating water and steam plants
  • Hydronic and steam distribution systems
  • Plumbing, including potable cold and hot water systems, natural gas systems, compressed air systems, vacuum systems, and waste and vent.
  • Fire protection systems


We do not provide in-house electrical engineering but possess fundamental electrical system knowledge and have associations with multiple electric engineering firms to assemble from service engineering teams. Our designs include new construction and remodels for commercial and institutional buildings, as well as sustainable housing.  We are a small and flexible firm with two long-time licensed mechanical engineers with current licenses in Oregon, Washington, Utah and Idaho.  We manage our design projects to insure that we meet project timelines.  We deliver project designs on the shoulders of our experience which combines 52 years of licensed experience between two senior design engineers. With SEG as designers, that experience is directly and comprehensively involved in your project.  And as with all projects we undertake, we will bring an energy efficiency perspective to your design.


What is special about SEG’s Design Services?

The background of SEG engineers is grounded in previous experience as mechanical contractors and in a long-time commitment to energy efficiency.  This translates to a practical and creative design approach for both small and large projects that incorporates the following design approaches, goals, and experience.


  • We understand the real-world of system performance and understand what it takes to build and operate mechanical systems.
  • We match system choices to the project’s needs.
  • We rely on proven system concepts but are not afraid to innovate, when appropriate, for a project.
  • Historically, we have been leaders in designing alternative mechanical systems including ground-coupled heat pumping, radiant floor heating and cooling, de-coupled mechanical systems, natural ventilation, and passive cooling.
  • We address energy code compliance issues comprehensively and early in the design.
  • We incorporate energy modeling for load analysis in all designs.
  • We have specialized experience in hospital, laboratory and higher education infrastructure.
  • We have extensive integrated design experience and an impressive resume of proven high performance designs.
  • We regularly work with design-build procurement approaches and can work with project teams to define flexible hand-offs to mechanical sub-contractors.
  • We are specialists in retrofit and remodel projects, and can provide existing system assessment and cost estimating services.
  • We cultivate a respectful team approach that includes owners, managers, building operators, and key external service providers.


Design Experience Highlights   

  • Various Western U.S. Federal Courthouses:  Chilled water system and chiller plant retrofits.
  • Commercial remodels:  Conversion from packaged rooftop HVAC to DOAS and VRF systems
  • New building designs:  Ground source heat pumps, DOAS, VRF, natural ventilation
  • High-rise design:  Smoke control systems, high-rise plumbing, atrium de-stratification
  • Hospital design:  Surgery suite airflow, isolation rooms, relative space pressurization control, and humidity control including considerations for infection control.
  • Laboratory design:  Space air pressure control, variable-volume hoods and fans.
  • Equipment building cooling:  Displacement ventilation, high-efficiency cooling, heat recovery systems
  • Special hazards:   HVAC for storage and use of chemicals and flammable liquids and gasses.
  • Plumbing design:  Heat transfer and recovery, high-efficiency (condensing) combustion, medical plumbing, laboratory waste, pumped waste, emergency shower/eyewash design with tempering.
  • Fire protection:  Dry systems, deluge and pre-action systems, water mist systems, inert gas systems, wet and dry chemical systems.