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home | Washington's Mechanical Contractor
Quality without Compromise since 1932
Since our founding over 79 years ago, you get uncompromising qualities every time R.M. Thornton begins your mechanical contracting project. From facilities service contracts to the most complicated commercial HVAC installations, repairs and retrofit projects, Thornton exceeds expectations by every measure. Our primary service area includes Maryland, Washington, DC, and Virginia.
Thornton is obsessed with customer service. And, we have the "teams" to prove it. Our corporate "team" structure puts a single project manager between you and the completed project. This single point of contact is responsible for all aspects of the job including design, budgets, estimating, purchasing, invoicing and labor coordination. The net result is a seamless process that delivers the best value quickly. Our blue chip client list appreciates Thornton's legendary customer service.
To do the finest job at the best price for you, Thornton has the best-trained, most experienced skilled plumbers, steamfitters, sheetmetal workers, and HVAC service technicians. Thornton has been recognized by the Washington Building Congress with fourteen Individual & Team Craftsmanship and Star Awards.
Sometimes there's a glitch. Or, the unexpected happens. Fortunately, this is when we shine. Our project managers, all with extensive field experience, take responsibility for your project. The Thornton team takes an old-fashioned approach and gets the job done the right way, starting with the handshake and lots of hard work.
Since its founding in 1932, Thornton has literally helped build many of Washington's landmarks. Our project experience covers the complete spectrum, ranging from replacing outdated equipment such as chillers and boilers, to installing fire protection systems, digital controls, large diameter piping, medical gas piping, geothermal heating and cooling systems , as well as sheet metal air duct systems, plumbing and 24-hour HVAC service. Today, Thornton is the model of sustainability with the most LEED Accredited Professionals of any mechanical contractor in the metro area.