Moving air and gas for a cleaner environment since 1968. T. C. Koester, Inc. is a family owned manufacturers representative dedicated to providing air and gas handling solutions to consulting engineers and industry. Our mission is to offer the highest quality engineered products while providing unparalleled service to our customers. Areas served include eastern New York (Albany, New York City, Long Island), New Jersey, eastern half of Pennsylvania, Delaware, Maryland, District of Columbia, and northern Virginia.