W.H. Demmons, Inc. is a design-build-maintain engineering firm focused on reducing energy costs for businesses, municipalities, and home-owners through engineering, design and installation of proven, innovative, energy-efficient building systems. The company's mission is to design, build, and maintain systems that create healthy, safe, and comfortable indoor environments.

Led by Douglas W. Martin, P.E., the W.H. Demmons, Inc. team has an average experience of over 25 years in the engineering, roofing and HVAC industry. W.H. Demmons' design-build-maintain services focus on geothermal, HVAC and roofing engineering systems, allowing for a balanced, holistic approach to whole-building energy efficiency. The company has been installing quality commercial roofs since 1914, specializing in commercial and high-end residential customers. Involved in geothermal system projects since 1992 when they completed their first project for Catholic Charities in downtown Portland, W.H. Demmons is the leading geothermal design-build-maintain-engineering firm in Maine. For more information about their services and expertise, visit www.whdemmons.com or call them at (207) 797-7468.