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

W.H. Demmons prides itself on its highly trained staff dedicated to designing, installing and maintaining energy efficient building systems


W.H. Demmons History

W.H. Demmons is a Design-Build-Maintain engineering firm focused on reducing your energy costs through proven innovative engineering, design and installation.

W.H. Demmons is comprised of three sub-companies: Maine Air Conditioning, Demmons Roofing and Demmons Geothermal. W. H. Demmons began in 1914 with the creation of Demmons Roofing, which has been installing quality commercial roofs ever since, including Duro-Last White Roofs.

In 1994, Maine Air Conditioning, which was founded in 1974, merged with W.H. Demmons. Maine Air Conditioning now operates as the HVAC division.

W.H. Demmons' HVAC division has sought to expand its services to include plan and spec projects. In 1992, W.H. Demmons HVAC proved itself to be a leader in innovation and technology having completed its first geothermal building.
W.H. Demmons has been an industry leader since 1914
W.H. Demmons' sheet metal company is capable of numerous custom fabrication projects

Since then, W.H. Demmons has been the forerunner in design and build geothermal construction in New England, having completed numerous geothermal projects such as office buildings, banks, inns, halls and class facilities.

Portland Sheet Metal
, another facet of W.H. Demmons, is a fabrication facility capable of handling a wide range of custom fabrication projects. The sheet metal shop is completely automated and computerized. Our projects consist of air distribution duct work for heating and cooling systems, kitchen hood installation including welded duct work, roofing and ventilation systems.

W.H. Demmons takes great pride in the expertise and dedication of all of its employees and strongly believes in continual education and training for all staff members. This commitment to excellence is one of the many reasons W.H. Demmons is a proven innovative leader in the fields of Geothermal, HVAC, Controls and Roofing.

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W.H. Demmons, Inc. | 93 Warren Avenue | Portland, Maine 04103 | 207-797-7468 | www.whdemmons.com