Johnstone Supply

Johnstone Supply operates as a commercial HVAC equipment distributor in Denver, Colorado, serving contractors and trades professionals across the metropolitan area. Located at their dedicated branch on the city's south side, the warehouse maintains extended hours six days per week, opening at 7 AM Monday through Friday and 8 AM on Saturdays to accommodate project timelines. With a rating of 4.3 stars drawn from 145 verified client reviews, the operation has built a reputation over multiple years of consistent service to the local contracting community. The business primarily serves professional HVAC technicians, sheet metal workers, and installation crews rather than residential homeowners, supplying the components and systems these tradespeople need to complete installations and repairs throughout Denver and surrounding communities including Aurora, Lakewood, and Westminster.

The warehouse distinguishes itself through an extensive inventory spanning multiple equipment categories and brand partnerships. Their stock includes single packaged units, split systems, mini-split configurations, air handlers, evaporator coils, and both gas and oil furnaces for residential and commercial applications. They offer field-installed accessories and multi-zone systems that enable contractors to customize solutions for complex retrofits and new construction projects. Extended warranty programs are available on select equipment lines, providing their contractor clients with additional margin protection on parts and labor. The operation maintains a contractor account request process, indicating a commitment to building long-term relationships with licensed installation professionals rather than walk-in retail traffic.

Client reviews illuminate the hands-on experience contractors have working with this supplier. Jeremy Joyce, a trades professional, specifically team members Josh and Shane for ensuring he receives proper fittings, electrical components, and commissioning materials for complete installations. Christopher Smith-Hawkins named Shane, Timmy, and Christian as staff members who consistently deliver professional service and hard-to-locate parts. Wiley Clinchers described the team as his best bet for locating obscure components and competitive pricing over five and a half years of patronage. However, contractor Kevin Lambert cited a frustrating experience with the returns policy, noting resistance to accepting a return on tested components.