JMD Corporation/Jackson Heating and Air is the leading heating, cooling and refrigeration specialist serving northern West Virginia and southwestern Pennsylvania. Whether your need is residential or commercial, we can provide you with the sales, service, and installation of the comfort system that is best for you. As mechanical contractors, we can provide metal fabrication, heating, ventilation & air conditioning services, refrigeration systems, commercial and industrial design, fabrication, repair and maintenance for all of your mechanical systems.