Proudly serving Omaha, Lincoln, Des Moines, Davenport, Kearney, Ames, Topeka, Grand Junction, Durango and surrounding areas. ... Johnstone Supply is your one-stop shop, with a variety of options in unitary and specialty equipment, repair and replacement parts, and maintenance supplies for Residential, Light Commercial, Refrigeration and Facilities Maintenance. We offer the products, programs and services that help contractors of all sizes succeed. We’re committed to being your HVACR resource from start to finish. read more