The Unified Group has announced that Shoffner Mechanical Services, Knoxville, Tenn., is its newest member. Formed in 1998, The Unified Group is an independent association of more than 50 hvacr commercial contractors, representing over $1 billion in revenue. The group specializes in helping its members increase productivity, profitability, and customer retention by providing training opportunities, exchanging information, sharing best practices, and negotiating purchasing agreements. It also serves as a network to pursue national and regional business opportunities. www.theunifiedgroup.com.