About RossHX A Quality Heat Exchanger Service Company - Its In The Name! Ross HX is headquartered in Middletown, OH. Ross HX is dedicated to providing its customers with Reliability, Organization, Safety, and Satisfaction. Ross HX understands how important time and savings are to each customer. Ross HX will strive to provide each customer with not only a product, but a solution. Let Ross HX be the Heat Exchanger Service company you can count on. If you are looking for superior results in a Heat Exchanger Company, Ross HX is ready to meet the challenge!