Joe Hamros started Commercial Service of Bloomington, Inc. in 1946 as a small 2-man heating repair company. 1973 - Jules Sonneborn purchased Commercial Service. 1975 - Mike Sonneborn, son of Jules Sonneborn, joined company and began developing developed relationships with large commercial companies and organizations in the area. Late 1990's - Commercial Service employed over 30 full-time employees with major commercial and residential Heating and Cooling projects throughout Bloomington and the surrounding area, and one of the largest Residential Trane Dealers in the state of Indiana. 2012 - Commercial Service partnered with R&S Plumbing to offer residential and commercial plumbing. R & S Plumbing, License #CO89100209, is a Commercial Service partner. 2015 - Mike Sonneborn retired from Commercial Service. Scott Rink was named President and CEO. Rink immediately named Adam Sater VP of Commercial Operations, Charlie Laughlin VP of Residential Operations & Greg Humphrey as CFO.