Lewellen LLC

Lewellen Associates is a professional Energy Efficiency Consulting firm.  Founded in 2013, Mr. Lewellen was previously a principal at Rice Group, Inc for 21 years and also has 16 years of utility experience, specializing in commercial buildings.  Duane has extensive experience in new construction & tenant improvement HVAC/Plumbing design as well as well as energy use and efficiency improvements in the built environment.  He has performed numerous preliminary and investment grade audits for large and small commercial and industrial buildings as well as government, education, and local municipalities.    He is an expert in the Washington State Energy Code, having sat on the Energy Code TAG, performs consulting and completes compliance forms.  Lewellen Associates provides building commissioning, evaluations, modeling, energy studies, measurement and verification, and retro-commissioning of building systems.  Duane is a LEED AP, EB, CEM and was recognized as an Association of Energy Engineers (AEE) and Edmonds Community College Distinguished Alumni for his work at the college and in the community. He is BOC Lead Instructor as well having 25 years experience teaching at the college level.  Duane is currently Region V Vice President and sits on the Board of AEE.


Key Contact

Duane Lewellen



18216 71st Ave W
Lynnwood, WA 98037

18216 71st Ave W
Lynnwood, WA 98037

Building Types Served

  • Commercial
  • Industrial

Business Types

  • Consulting

Services Offered

  • Commercial/industrial HVAC products/services
  • Education/information
  • Energy planning/consulting
  • HVAC/controls optimization
  • Retro-commissioning

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