Comfort Systems USA alters ambient air automatically. The company sells and services commercial HVAC (heating, ventilation, and air conditioning) systems in apartments, health care facilities, office buildings, manufacturing plants, retail centers, and schools. The company maintains more than 40 operating units in nearly 75 cities throughout the US. In addition to HVAC services, Comfort Systems designs building automation control systems that integrate, monitor, and operate HVAC, lighting, and access control systems. Some company locations also offer fire protection, plumbing, and electrical services. Comfort Systems was established in 1997.

The Kleinfelder Group isn't afraid to get its hands dirty. Since its start as a materials testing lab in 1961, the company has expanded to become one of the largest engineering consulting and design groups in the US. Kleinfelder's operating subsidiaries offer soils and materials testing, geotechnical engineering, construction management, and environmental services. With about 50 domestic offices and locations in Australia and Guam, the group targets the energy, transportation, water, commercial/industrial, government, and education markets; projects run the gamut from building underground parking garages to establishing wind farms. Jim Kleinfelder, who retired in 1993, founded the employee-owned company.

MARCOR Remediation provides industrial, environmental, and construction site remediation. Its services include asbestos abatement, wastewater treatment, emergency spill response, disaster recovery, and storage tank management. It also provides decommissioning and demolition, duct cleaning services, and geotechnical and environmental drilling and sampling. Projects have ranged from mold remediation in a California hotel to clean-up operations in hurricane-battered Florida and Louisiana, to the decommissioning of contaminated gun ranges for the Pennsylvania Army National Guard. In 2009 the company became a subsidiary of demolition and remediation firm Nuprecon/CST.

Bor-Son Construction operates mainly in Minnesota, offering design and building services for commercial, government, educational, health care, industrial, and multi-unit housing construction. Founded in 1957, Bor-son Construction also offers renovation, finish carpentry, and concrete and masonry services. Clients include Cargill, Hyatt Hotels, the University of Minnesota, and the Minnesota Judical.

SIG plc is a leading European supplier of specialist products to the building and construction industry. It focuses its activities into four business sectors: Insulation and Building Environments, Exteriors, Interiors and Specialist Construction Products.SIG’s operations are managed on a country-by-country basis. Within each country there is dedicated divisional management focusing on each market sector. This is critical to the success of the business, ensuring that focus is provided to both the customer requirements and the supply chain required to service the customer.

Gray Construction doesn't have the blues when it comes to building projects. The firm is a top US design and construction firm. Through its subsidiaries the company works on a large array of commercial and industrial projects in the US and Japan. It ranks among the top US contractors in auto plant, distribution/warehouse, and processing plant construction. It also serves the federal government (including military projects), education, medical, and retail industries. Subsidiaries include WS Construction (heavy industrial and commercial contracting); Gray-I.C.E. Builders, Inc. (retail, commercial, industrial, and public construction); and Operations Associates (facilities, supply chain, and consulting).

Skanska UK, the British subsidiary of Sweden-based global contractor Skanska AB, provides a wide range of engineering and construction services. The group specializes in private finance initiative (PFI) projects, and offers services in the building, civil engineering, mechanical and electrical, engineering design, and residential sectors. Skanska UK also offers specialty contracting services such as telecom network installations, piling and foundation work, and steel decking. The division has participated in such notable United Kingdom projects as the Channel Tunnel Rail Link, the remodeling of the Ministry of Defence headquarters in London, and new facilities for the Scottish Prison Service.

Colson & Colson is the general contractor so good they named it twice. The company develops, builds, and operates retirement communities throughout the US, Canada, and the UK. It has built or managed more than 300 retirement communities since it was founded in 1963. Colson & Colson primarily develops properties for former affiliate Holiday Retirement (HRC), the #1 owner and manager of retirement homes in the US and Canada. It provides site selection, rezoning, construction, and finance services. Prior to focusing exclusively on retirement facilities, Colson & Colson developed single-family residential, commercial, and retail properties as well. The Colson family owns the majority of Colson & Colson.

Design/build construction firm McShane Construction Company plans, executes, and closes out construction projects in the Midwest, Southeast, Southwest, and the West Coast of the US. The firm specializes in building for markets including health care, hospitality, industrial, institutional, multi-unit residential, office, and retail. Best known for its education and industrial process facilities, McShane has worked for clients such as Notre Dame, Ford, and General Mills. Established in 1984 by CEO James McShane, the company is a part of The McShane Companies, which also includes Texas-based Cadence McShane Construction.

TimberWest attempts to stay a cut above the rest. The forestland management company owns more than 320,000 hectares (796,000 acres) of forest in western Canada, making it one of the largest owners of private forestlands in the region. The company has had an annual harvest of about 2.5 million cubic meters of logs. However, harvest levels have been reduced and about 17% of TimberWest's land has become more valuable than the Douglas firs growing on it. The company's real estate arm, Couverdon, plans to make available more of its real estate for development over then next 10 to 15 years.

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