W.H. Demmons in Portland, Maine designs-builds-maintains energy efficient building systems including HVAC, Controls, Geothermal Heating & Cooling, Duro-Last White Roofs, Metal Roofs & more. W.H. Demmons, Inc. meets all your HVAC, Geothermal and Roofing needs

Vision Statement

To be recognized as the most innovative, best
quality building systems contractor in Maine.

Mission Statement

To design, build, and maintain systems that create
healthy, safe, and comfortable indoor environments.

Roofing Portland Maine

Reduce costs with innovative roofing! Portland, Maine residents come to W.H. Demmons for design-build-maintain engineering, focused on reducing your company's energy costs. We have a long list of projects that prove the worth of our design and installation work.

Comprised of three sub-companies: Maine Air Conditioning, Demmons Roofing and Demmons Geothermal, W.H. Demmons is dedicated to cutting your energy costs. Our longevity and sustainability in the industry is a testament to the company's expertise and experience.

We've continued to grow as a company and have been selected for such prestigious energy-efficient engineering projects as the Maine National Guard building in Skowhegan, Maine, multiple buildings on the campus of Colby College, and the York County Courthouse, which was built in 1850 and has recorded savings of $25,000 a year since we completed work.

Not only did we save the government money and help to guarantee the continued existence and functionality of this historic building, we also led the way for the county's move away from non-renewable energy. Even after putting in air conditioning, our geothermal system allows the York County Courthouse to save taxpayers $69,000 in the first year alone.

We've got numerous success stories, including the Saco Transportation Center in Saco, Maine, a quaint train station located on Saco Island that's been described as "America's first truly green train station." We're a proud American company that's committed to making strides in geothermal energy.

We're frontrunners in energy-friendly roofing. Portland, Maine businesses and residents choose our innovative designs and specs for renewable energy, economical roofs, and geothermal power. All of our projects are fully customized for our clients' needs, and we're able to adapt design with our in-house sheet metal company, Portland Sheet Metal, to create custom air ducts, HVAC ducts, roofing, and ventilation systems.




Reliable Controls

Maine Air Conditioning now operates as the HVAC division, including a controls department focused on cost efficient user-controlled systems.

Click here to learn more about W.H. Demmons HVAC and Controls Division

Design & Installation

W.H. Demmons is a proven forerunner in design and build geothermal construction in New England, having completed numerous geothermal projects since 1992.

Click here to learn more about W.H. Demmons Geothermal

Duro-Last White Roofs

Our highly trained and experienced engineers can help you design a highly efficient roofing system, including the only New England installer of Duro-Last White Roofs.

Click here to learn more about W.H. Demmons Roofing
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W.H. Demmons, Inc. | 93 Warren Avenue | Portland, Maine 04103 | 207-797-7468 | www.whdemmons.com