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.

Columbia Pipe & Supply. Columbia is a leading distributor of industrial pipe, plumbing supplies, and HVAC (heating, ventilation, and air conditioning) equipment. Based in Chicago, the company also has sales offices covering the rest of Illinois, Indiana, Michigan, and Wisconsin, and an agreement with Affiliated Distributors that expands its distribution network to a national level. The company's target markets are construction, maintenance and repair, and OEMs. CEO William Arenberg and family own the company, which was founded in 1935.

Designer Doors makes it. The company designs and builds solid wood entry doors, garage doors, shutters, and gates. It specializes in luxury doors and offers one-of-a kind handcrafted creations as well as limited editions of European-inspired and American panel designs. Its Woodscapes brand offers less expensive options. Doors are available in a variety of styles and can be made from wood, glass, or metal. Decorative steel hardware also is available. The company's network of professional design associates sell products directly to architects, builders, and homeowners throughout the US. Kent Forsland founded Designer Doors in 1987.

Tetra Tech NUS, Inc., provides environmental consulting, engineering, and remediation services. Its expertise extends to such areas as air quality management, compliance services, environmental analysis and planning, health sciences, homeland security, information technology, radioactive and hazardous waste investigation and protection, and water and wastewater treatment. Now part of engineering giant Tetra Tech, the company stemmed from nuclear utility consulting and engineering firm Nuclear Utility Services Corporation (NUS Corporation), which was founded in 1960. Clients, including government agencies and commercial industries, are served through 17 offices across the US.

QualServ Corporation company brings together everything from design and construction to millwork, equipment, furniture, and fixtures for opening a restaurant or a wide variety of other businesses and institutions. QualServ also serves up installation, maintenance, and repair services. Customers may also order à la carte from QualServ's menu of products and services. QualServ's clientele has included the likes of Chipotle Mexican Grill, Extended Stay America, Papa John's, and Red Robin Gourmet Burgers. QualServ partners with Direct Capital Corporation to offer financing.

Industrial Molding Corporation shapes its own future by providing precision injected-plastic moldings, as well as insert molding, automation engineering, assembly, decorating, and logistics. Customers include manufacturers in the automotive, medical/dental, bearing, electronic, recreational, fiber optic, and consumer goods industries. The company operates a 150,000-sq.-ft. injection molding manufacturing plant, and more than 80 plastic injection molding machines. Industrial Molding is a subsidiary of NN, Inc., a producer and supplier of high-quality, precision steel balls and rollers to bearing manufacturers worldwide.

ABI (UK) makes a wide range of manufactured second homes, known in the UK as holiday homes. Its models have one, two, or three bedrooms; options include electric fireplaces and kitchen islands. Prices range from about £16,000 ($26,000) to some £61,000 (approximately $99,000). The company sells its homes to dealers and holiday parks throughout the UK and Ireland and in about a dozen European countries. Top customers include Parkdean Holidays and Park Resorts. ABI (UK) was formed as Ace Belmont International in 1972 following the merger of travel trailer company ACE International and leisure home company Belmont.

FAFCO runs hot and cold. The company makes solar swimming pool-heating systems, solar hot water heaters, and thermal energy storage systems. FAFCO's heating systems utilize solar panels to control the temperature of water. Its solar domestic hot water system, Hot2o, was developed as a result of a 10-year partnership with the Department of Energy. The company also manufactures IceStor -- a product that controls commercial cooling costs by storing energy at night during off-peak times, and then releasing it to cool buildings during the day. Customers include schools, hotels, and offices. Its solar water heaters are marketed to homeowners. FAFCO was founded in 1969 by chairman Freeman Ford and Richard Rhodes.

Community Asphalt provides paving services for the road more traveled. The company's services include grading and paving, pavement milling, surveying, excavation, on- and off-road hauling, drainage, utilities, base finishing, and highway sweeping. It also provides engineering contracting and design/build services; projects include parking lots, industrial and retail complexes, auto race tracks, and airport runways. Formed in 1980, Community Asphalt has three asphalt plants in southeastern Florida. It also operates a limestone quarry, and a fleet of dump trucks. In 2006 Community Asphalt and Spain's Huarte Lain (OHL) made a stock purchase agreement, which gave OHL a controlling interest in the company.

Fieldstone Communities leaves ne'er a stone in the field unturned as it builds homes in California, Texas, and Utah. The company is part of The Fieldstone Group of Companies and operates as Fieldstone Communities. It builds homes ranging from $100,000 in San Antonio to more than $1 million in Southern California; sizes range from 1,200 sq. ft. to 4,400 sq. ft. It also offers a free Homebuyers Club in Texas and Utah to assist first-time homebuyers. The company, founded in 1981 by chairman Peter Ochs and vice chairman Keith Johnson, has built more than 23,000 attached and detached homes. Some projects have stalled due to the credit and housing crisis. However, Fieldstone is looking to expand in Texas.

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