The TZP Group has sold The Dwyer Group back to The Riverside Company. Financial terms weren’t announced. Waco, Texas-based Dwyer is a holding company of seven franchise businesses focused on residential and commercial services. The companies include Aire Serv, Glass Doctor, The Grounds Guys, Mr. Appliance, Mr. Electric, Mr. Rooter (Drain Doctor in the UK and Portugal), and Rainbow International. In December 2010, The Riverside Company announced it was selling The Dwyer Group to TZP in a deal valued at $150 million.