About Us

History of the Wilmington Office

The Delaware territory was assigned to John Renninger as an independent franchise in 1959 with a staff of 3; two sales engineers and a secretary. The business was incorporated in 1969, trading as Renninger Trane. Although the focus was equipment sales, with 70% of the business conducted with the DuPont Company, Renninger Trane hired its first service engineer. John Seiberlich joined the company in 1972 as a sales engineer, along with two additional service engineers.

In 1982, the first service sales person was hired to concentrate on expanding our service business by selling service contracts.

The Building Automation Systems group was formed in 1987 to serve our customers' controls needs.

In 1993, the business was sold to John Seiberlich with a staff of 32 associates and $4.1M in revenue. The name of the company was changed to Seiberlich Trane. While the business continued to grow, there was now a focus on Building Automation Systems and Service instead of equipment sales. The Contracting Solutions group was established in 1999 to provide customers packaged solutions to their HVAC needs.

Today, Seiberlich Trane employs 70 associates, including 24 highly specialized service and BAS technicians. In August of 2010, Seiberlich Trane was recognized as one of Delaware's Top Workplaces, based on the results of associate opinion surveys.  The company has exceeded $20,000,000 in revenue with over 130 commercial service contract customers maintaining both equipment and controls systems. Seiberlich Trane maintains sales and service associates in locations to serve northern and southern Delaware, the eastern shore of Maryland, and southeastern Pennsylvania.