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EXHIBIT 21
LIST OF SUBSIDIARIES OF THE REGISTRANT
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COMPANY NAME STATE OF INCORPORATION
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A-1 Air Conditioning, Inc. Tennessee
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A/C Service & Installation Co., Inc. Tennessee
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Ainsley & Son Heating, Inc. Tennessee
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Air-Conditioning and Heating Unlimited, Inc. Tennessee
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All American Air Conditioning & Heating, Inc. Tennessee
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Alpine Air Conditioning Company Tennessee
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Arrow Heating & Air Conditioning, Inc. Wisconsin
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Artic Aire of Chico, Inc. California
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B & B Air Conditioning, Inc. Tennessee
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B.W. Heating & Cooling, Inc. Tennessee
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Becht Heating & Cooling, Inc. Tennessee
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Berkshire Air Conditioning Company Tennessee
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Bill Ingraham Service Company, Inc. California
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Brand Heating & Air Conditioning, Inc. Indiana
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C. Iapaluccio Company, Inc. Connecticut
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Chief/Bauer Heating & Air Conditioning, Inc. Tennessee
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Claire's Air Conditioning and Refrigeration, Inc. Tennessee
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Climate Control, Inc. Tennessee
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Coastal Air Conditioning Service, Inc. Georgia
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Comerford's Heating & Air Conditioning, Inc. California
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Comfortech, Inc. Tennessee
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Contractor Success Group, Inc. Missouri
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Custom Air Conditioning, Inc. d/b/a Service Experts of Palm Beach Tennessee
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Dan Jacobs Heating & Cooling, Inc. Tennessee
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Davis the Plumber, Inc. Tennessee
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Dial One Raymond Plumbing, Heating & Cooling, Inc. d/b/a Dial One Service Tennessee
Champions
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Donelson Air Conditioning Company, Inc. Tennessee
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Eisenbach Enterprises, Inc. Texas
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Falso Service Experts, Inc. d/b/a Falso Heating and Sheet Metal Co., Inc. New York
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Frees Service Experts, Inc. Texas
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Freschi Air Systems, Inc. Tennessee
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Gaddis Co. d/b/a Desert Air Conditioning Tennessee
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George B. Givens Company, Inc. Tennessee
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Getzschman Heating & Sheet Metal Contractors, Inc. Tennessee
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Gilley's Quality Heating & Cooling, Inc. Tennessee
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Gordon's Specialty Company Tennessee
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Gulf Coast Cooling, Inc. Tennessee
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Holmes Sales & Service, Inc. Tennessee
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Island Air Conditioning, Inc. Tennessee
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J.M. Jenks Incorporated Utah
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Knochelmann, Inc. Tennessee
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Lee Voisard Plumbing & Heating, Inc. Tennessee
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Mid Fla Heating & Air, Inc. Tennessee
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Norrell Heating and Air Conditioning Company, Inc. Alabama
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COMPANY NAME STATE OF INCORPORATION
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Pardee Refrigeration Company Incorporated d/b/a Pardee Heating & Air Tennessee
Conditioning
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Parker Heating & Air Conditioning, Incorporated Tennessee
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Parrott Mechanical, Inc. Idaho
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ProAir Services, Inc. Tennessee
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Roland J. Down, Inc. New York
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Rolf Coal and Fuel Corp. Indiana
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S & W Air Conditioning, Inc. Tennessee
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Sanders Indoor Comfort, Inc. Tennessee
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SEI Management Company, LLC Tennessee
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SEI Management Subsidiary, Inc. Tennessee
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SEI Newco, Inc. Tennessee
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Service Experts of Arkansas, Inc. Arkansas
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Service Experts of Indianapolis, Inc. Indiana
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Service Experts of Palm Springs, Inc. California
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Service Experts of Raleigh, Inc. d/b/a Piedmont Air Conditioning Co. Tennessee
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Service Experts of St. Louis, Inc. Missouri
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Service Experts of Utah, Inc. Utah
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Stanley Heating and Air Conditioning, Inc. Tennessee
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Stark Services Company, Inc. d/b/a Air Experts Tennessee
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Strand Brothers, Inc. Tennessee
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Sunbeam Service Experts, Inc. New York
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Superior Air Conditioning, Inc. Tennessee
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Sylvester's Corp. Indiana
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Teays Valley Heating and Cooling, Inc. West Virginia
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The McElroy Service Company Nebraska
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Thompson and Sons Heating and Air Conditioning Company Tennessee
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TML, Inc. Idaho
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Triton Mechanical, Inc. Tennessee
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Venture International, Inc. Tennessee
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Vision Holding Company, Inc. Missouri
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