Johnstone Supply The Balsan Group employees have extensive HVACR knowledge and take part in ongoing training to ensure our customers are provided with superior customer service and solutions. We have 19 locations in Pennsylvania, Maine, Massachusetts, Maryland, New York, New Hampshire, and Vermont. We have convenient access to a huge distribution center with over $200 million in inventory and a complete line of OEM parts for all equipment manufacturers. You can trust us to have the largest selection of products and the superior service to make your job easier!