New Prostock stores opened throughout Illinois, Indiana and Kentucky to serve HVAC contractors and service mechanics in the stores' surrounding areas. There is one Kentucky location in Owensboro and five Illinois locations in Addison, Chicago, Elgin, Mt. Vernon and Tinley Park.

Prostock, a replacement parts division of Rheem Air Conditioning, provides replacement parts and a variety of aftermarket parts, supplies and accessories. Park Supply, the owner for most branches, owns several other stores in the greater Chicago, northwest Indiana and western Kentucky areas and offers local delivery, training classes and a promotional advertising program for its customers.