Johnstone Supply Balsan Group Share: HVAC Johnstone Supply Balsan Group Visit Website 55 Country Club Drive Suite 201 Downingtown, PA 19335 (413) 781-1721 (413) 781-7549 (fax) http://www.johnstonesupply.com Map What's Nearby? Distance: 5 10 15 20 25 50 mi.