Johnstone Supply

Johnstone Supply in Naperville operates as a wholesale heating equipment distributor serving contractors and DIY homeowners across Chicago's western suburbs. Based on 43 customer reviews, this location maintains a strong 4.4-star rating, reflecting consistent service quality over three decades in business. The store serves Naperville residents directly while also supplying neighboring communities including Aurora, Bolingbrook, and Woodridge with professional-grade HVAC components.

What distinguishes this Naperville location is its extensive inventory spanning residential and light commercial systems. The warehouse stocks major equipment categories including furnaces (gas and oil models), split systems, single packaged units, and increasingly popular mini-split variable-capacity systems. Their digital catalog enables contractors to cross-reference hard-to-find components, while their inventory of field-installed accessories supports complex retrofit projects often encountered in older western suburban housing stock.

Customer reviews consistently recognize branch manager Brad for technical depth, particularly regarding flame sensor diagnostics and ignition system troubleshooting. Multiple reviewers describe Johnstone as their sole source for specialty parts, a distinction that matters when equipment failures occur outside standard business hours. Josiah Duehning notes a decade of reliable service, while Jonathan Mag specifically praises staff who "go above and beyond" to assist with product selection.