Larry Rumer became interested in the heating and air conditioning industry when he was a young man. In 1964, he enrolled in an adult vocational program in Jackson, Ohio. After completing his education, he worked for Wheeling Heating and Hitt Heating. In 1975, he decided to strike out on their own. Working out of his home on Clark Road in St. Clairsville, he soon outgrew that location. He purchased land nearby and built a commercial building with an office, sheet metal shop, garage, and storage. In 1987, a Barnesville office was opened at 110 East Main Street, managed by son-in-law Sid Loudin, thus the current name Rumer-Loudin, Inc. In 1998, Larry sold the Barnesville branch to Sid, and then the St. Clairsville office in 2006. Larry stayed on part-time until 2008 when he fully retired. In December of 2012, the Barnesville operations moved to 823 East Main Street. St. Clairsville remains open at its current location of 67679 Clark Road.