Dor-Mar Heating and Air Conditioning has been serving Newark, Columbus, Zanesville, Lancaster Ohio since 1962. Starting out as a small door-to-door company, Dor-Mar has grown to be one of the largest heating and cooling service companies in Ohio. Dor-Mar is family owned and operated and we hold our employees to the highest standards to ensure we continue to provide our customers with the best HVAC service possible. We have 30 employees, all who are passionate about taking care of our customer’s needs. Our employees attend monthly training, making sure we keep up with the ever-changing HVAC field. As a result of our hard work and honesty, Rheem & Coleman has recently recognized us as a “ Top Team Contractor.” We offer free estimates on new equipment, and provide customers with 24-hour service.