Roth expanded into federal contracts in the 1930s and added air-conditioning service in the 1940s. In the 1950s and 1960s, Roth started working on shopping centers. In the 1970s, Roth Bros. expanded their reach to cover the eastern United States and by the 1980s, had covered the nation.
"We are grateful to our customers for the opportunity to serve them over the years. With the difficult economy, we are focused on adding value by saving our customers energy and operating expenses," said company President Paul Belair.