TDIndustries, the specialty contractor installs heating, ventilation, and air-conditioning (HVAC); electrical; and plumbing systems in commercial, industrial, and multifamily residential buildings. TD also offers facility services including repairing and upgrading mechanical systems. The company maintains HVAC systems for the Houston Airport System and Rice University, among others. TD works primarily in Texas, but also has operations in Arizona. High-profile projects have included work on the Texas Governor's Mansion and the Dallas Cowboys Stadium. Chairman Jack Lowe Jr.'s father founded the employee-owned company in 1946.

MEDCO Construction, a subsidiary of Baylor Health Care System. The general contractor began building hospitals and other facilities for the health care industry. It now has expanded its project list to include office buildings, education and athletic facilities, churches, and renovations. The company has three divisions -- millwork, electrical, and mechanical -- that carry out its work in millwork fabrication and installation; electrical and voice and data installations; concrete framework placing and finishing; mechanical and plumbing services; and engineering and layout services.

Howard Stanley Hart was a turn-of-the-century entrepreneur, inventor, industrialist, and builder. In 1892, in partnership with Norman P. Cooley, he established the Hart & Cooley Manufacturing Company in Chicago, the first cold-rolled steel plant west of Pittsburgh. One of Hart's many inventions of the next few years was a steel heating register that proved superior to traditional heavy cast-iron models.

Severfield-Rowen Plc is a holding company for a specialist engineering group of companies that design, manufacture, and erect structural steelwork throughout the UK. Its operating subsidiaries include Severfield-Reeve Structures and Rowen Structures. The company operates the largest single production facility for the fabrication of structural steelwork in the UK. Besides fabrication and building subsidiaries, the company also provides project management of building and overseas contracts, property portfolio management, and steel trading services. One of its largest projects to date is its work on Heathrow's Terminal 5, involving 65,000 tons of steel. It is also providing steelwork for a Rolls-Royce factory.

A scrap metal processing and recycling company, Upstate Shredding converts scrap metal from appliances, automobiles, machines, and other sources into commodities sold to mills, foundries, and manufacturers around the world. It processes both ferrous (iron) and nonferrous metals -- including 700,000 tons of iron and 21,000 tons of aluminum annually -- and sells a significant portion of its products to steel mills in India, China, and other Asian countries. Founded in 1996 by president Adam Weitsman, Upstate Shredding is today one of New York State's largest privately-owned scrap metal companies.

Cavalier Homes builds castles for regular Joes. Through about a half-dozen plants the company makes manufactured single- and multi-section homes for the low- to medium-priced market in the south-central and south-Atlantic US; it delivers around 4,000 homes annually. Louisiana is its largest market. Cavalier Homes also makes cabinetry and laminated wallboard. The company markets its products through a network of about 50 exclusive and about 240 non-exclusive dealers, as well as one company-owned retail center. Southern Energy Homes, a subsidiary of Berkshire Hathaway portfolio company Clayton Homes, bought Cavalier Homes for nearly $50 million in 2009.

Psomas, the engineering firm offers construction management, land surveying, water resource planning, environmental, and civil engineering services mainly to the water, transportation, and land development markets in the Western US. The company has both public and private sector clients. Among the projects it has had a hand in developing are the Los Angeles International Airport, Port of Los Angeles, University of California, Los Angeles, and Walt Disney Concert Hall. Psomas has offices throughout California, as well as in Arizona an Utah. The family-owned firm was founded in 1946 by George Psomas.

The engineering and construction conglomerate (also known as the Ledcor Group of Companies) holds a network of firms focused on large-scale projects in Canada and the US. The group operates through divisions that specialize in commercial building, heavy civil, industrial, contract mining, and pipeline construction. Ledcor builds condos, office buildings, airports, highways, and industrial complexes; provides mining excavation; and offers network equipment installation, network site maintenance, and fiber-optic cable maintenance. Subsidiary Ledcor Properties invests in real estate. Employee-owned Ledcor was founded in 1947 by William Lede, the father of CEO Dave Lede.

MDU Resources builds and repairs the infrastructure our nation needs — the roads, the power lines, the electrical wiring and appliances, the building foundations. And MDU Resources supplies the energy and fuel our nation needs — building a strong America. In doing so, MDU Resources cannot overlook its responsibility to the environment, the communities we serve and our stakeholders. Through established operational practices and by leading or participating in a number of programs, MDU Resources helps ensure a viable environment. These practices include minimizing waste and maximizing resources, supporting environmental laws and regulations that are based on sound science and cost-effective technology and complying with or exceeding all applicable environmental laws, regulations and permit requirements.

Carlisle SynTec knows that a dry roof over one's head is a good thing. Carlisle SynTec Incorporated makes and installs roofing membrane and insulation products designed to withstand heat, puncturing, water, and load strain, primarily for commercial and industrial use. However, school's also are big customers. Products are sold under the brands Sure-Seal, Sure-Tough, Sure-White, FleeceBACK, Sure-Flex, and Sure-Weld. In the US the company has manufacturing facilities in Illinois, Mississippi, Pennsylvania, and Utah. Carlisle SynTec, which is a subsidiary of manufacturing group Carlisle Companies, has produced more than 15 billion sq. ft. of single-ply roofing membrane material since it was founded in the 1960s.

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