Johnstone Supply Seattle is a wholesale distributor serving professional HVACR contractors. Johnstone has the largest selection of equipment and genuine OEM parts in the industry. We have replacements for nearly every major brand and an extensive cross reference that makes sourcing hard-to-find parts easy. Our selection is continually expanding to meet the needs of our contractors and to ensure we have the best brands and technology to get the job done. Johnstone Supply: Making our communities comfortable and healthy.