EXHIBIT 21

SUBSIDIARIES OF THE
REGISTRANT

Subsidiary State of Incorporation
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AC Service & Installation Co., Inc. Tennessee

Air Experts, a United Services Co., Inc. Missouri

Arrow Heating & Air Conditioning, Inc. Wisconsin

Brand Heating & Air Conditioning, Inc. Indiana

Coastal Air Conditioning Service, Inc. Georgia

Comerford's Heating and Air Conditioning, Inc. California

Contractor Success Group, Inc. Missouri

Donelson Air Conditioning Company, Inc. Tennessee

Gilley's Heating & Cooling, Inc. Louisiana

Hardwick Air Masters, Inc. Arkansas

Norrell Heating & Air Conditioning, Inc. Alabama

Rolf Coal and Fuel Corp. Indiana

Service Experts of Palm Springs, Inc. California

Vision Holding Company, Inc. Missouri