Johnstone Supply

Johnstone Supply Store 178 sits in Oklahoma City as a trusted equipment and parts supplier for HVAC professionals and skilled homeowners tackling their own repairs. The location earns a 4.6-star rating drawn from 30 customer reviews, with a consistent strength in technical guidance rather than installation labor. The shop operates weekdays from 7:30 AM to 5 PM, serving the broader OKC metro and surrounding communities. This is not a retail showroom for do-it-yourselfers seeking plug-and-play units, it functions as a trade counter where technicians and experienced DIYers source components, request diagnostics, and consult on complex system failures.

The product catalog spans residential and commercial HVAC categories: split systems, mini-splits, manufactured housing units, packaged terminal air conditioners, heat pumps, and geothermal systems. Their parts selection covers the full replacement lifecycle, compressors, motors, blower assemblies, heat exchangers, defrost heaters, expansion valves, filter-driers, and electrical controls. A standout feature visible in reviews involves counter staff testing components on-site, saving customers from purchasing known-defective parts. This diagnostic service separates the location from online-only suppliers where buyers purchase without verification.

Customer stories from the reviews reveal the technical support team making tangible differences. Brandon and the counter staff earn repeated mentions for troubleshooting walk-in inquiries, with one reviewer (James 'BATMAN' Batterson) describing how they tested a suspected-bad part, declared it functional, and pointed him toward a cheaper alternative that solved his issue. Another reviewer (Lance Shaw) describes relying on their guidance to avoid hiring a repair technician entirely. A single negative review cites an unpleasant interaction with an individual employee, though other reviewers specifically praise the team's approachability.