Dominion Service Company is a full service heating, air-conditioning, ventilation and indoor air quality contractor servicing businesses and homes in Virginia.ts and ventilators. Dominion Service Company of Richmond provides maintenance, duct modification, air sterilization and duct cleaning services. Additionally, the company offers scheduling and financing services for residential, commercial and industrial customers. It has a staff of trained and certified technicians that provides remote monitoring, customer support and 24-hour emergency services. Dominion Service Company of Richmond is located in Richmond, Va.