Johnstone Supply

Johnstone Supply operates as a contractor-only HVAC equipment supplier on Chicago's South Side, serving professional tradespeople and businesses rather than retail customers. With a 4.6-star rating drawn from 100 reviews, the company stocks residential and commercial heating and cooling systems alongside an extensive inventory of components, controls, and thermostat technology. Their storefront at 1200 W. Cermak Rd. serves the Pilsen, Little Village, and Near West Side neighborhoods with weekday hours extending to 4:30 PM and Saturday availability until noon.

The supplier differentiates itself as a trade-only source, restricting purchases to licensed contractors which ensures professional-grade equipment stays within qualified hands. Their inventory spans mini-split systems, variable capacity systems, geothermal units, and manufactured housing solutions alongside traditional split systems and single packaged units. The parts division offers an unusually deep selection of refrigeration components including accumulators, capillary tubing, sight glasses, solenoid valves, and expansion valves, while their control section covers air conditioning, commercial, electrical, gas heat, and heat pump automation systems.

Customer reviews highlight specific team members making a difference. Rolando earns consistent praise for product knowledge and determination to resolve customer needs, with one reviewer noting counter service is ALWAYS helpful. Contractor reviewers appreciate access to tools and parts at competitive pricing compared to big-box alternatives, though two reviews flag occasional issues with order accuracy and one describing an unhelpful interaction with a different staff member named Ronaldo Macias.