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  • M. S. Johnston Co.
    M. S. Johnston Co.
    301-733-1066
    13261 Pennsylvania Ave., 21742-2698  Hagerstown

    M.S. Johnston Company is licensed in Maryland, Pennsylvania, West Virginia and Virginia. York air conditioning dealer – 67 years. M. S. Johnston Company entered the HVAC industry in 1939 by becoming an authorized York air conditioning distributor. Through 67 years of continuous operation in this …