Johnstone Supply

Johnstone Supply operates as an HVAC equipment distributor in Rockford, Illinois, serving both the immediate Rockford area and neighboring communities including Madison, Wisconsin. The location maintains regular business hours Monday through Friday from 7 AM to 4:30 PM, closed on weekends. Based on 39 customer reviews, the business holds a 3.6-star average rating, representing a mix of homeowner transactions and professional contractor accounts. As a supply house, the operation focuses on providing parts, units, and installation accessories rather than full installation services, though several reviewers referenced successfully completing DIY repairs using purchased components.

The Rockford location distinguishes itself by maintaining inventory of critical repair components that many suppliers lack, including furnace ignitors, control boards, and evaporator coils available for immediate pickup. Their website showcases an extensive catalog spanning residential split systems, mini-split configurations, gas and oil furnaces, and commercial packaged units. The business offers access to extended warranty programs and stocks field-installed accessories for both standard and variable-capacity systems. Several reviewers specifically praised the ability to obtain parts the same day without waiting for shipping, describing the staff as knowledgeable when customers came prepared with component numbers or diagnostic information.

Multiple reviewers shared specific positive experiences with the Rockford team. Kelly described calling about a failed furnace ignitor during cold weather and receiving same-day assistance, bringing in the old part for verification and leaving with a functional replacement. Jeffrey Luteyn recounted a diagnostic conversation where the staff worked through a process of elimination and confirmed a faulty control board, then offered additional suggestions during the repair process. Both customers noted the staff provided practical guidance that enabled successful DIY resolution without requiring professional installation appointments.