Johnstone Supply

Johnstone Supply operates as a heating equipment supplier in Cary, Illinois, serving contractors and trades professionals across McHenry County. The retail location maintains standard weekday hours from 6:30 AM to 4 PM, closing on Mondays and weekends. With a 3.6-star rating derived from 25 customer reviews, the store provides HVAC equipment, components, and accessories to the professional trade community. The company carries both commercial and residential equipment lines including packaged units, split systems, furnaces, and air handlers.

This supplier distinguishes itself through an extensive product catalog spanning multiple HVAC categories, from field-installed accessories to multi-zone systems and variable capacity units. The location participates in regional rebate programs, notably Wisconsin Focus on Energy initiatives. Their commercial division supports larger RTU (rooftop unit) quoting projects, while the residential lineup includes extended warranty options. The store also offers live fire training sessions in Minnesota and Chicago markets, indicating commitment to contractor education.

Customer experiences reveal mixed service levels. David Valentino praised the team for accommodating an urgent inducer motor need on a Saturday during the holiday weekend, noting fair pricing and friendly assistance. Mitchell Moore highlighted the counter staff positively after a year of shopping, appreciating the McHenry County location's inventory depth despite Saturday closures. However, Paul S recounted difficulties obtaining specific parts including rollout switches and draft inducers, feeling the experience reflected restrictive policies.