Johnstone Supply

Johnstone Supply operates as a heating equipment supplier in Menomonee Falls, Wisconsin, serving the greater Milwaukee metropolitan area including Waukesha and surrounding communities. With a rating of 4.1 stars from 39 customer reviews, this contractor-focused distributor stocks commercial and residential HVAC equipment along with genuine OEM replacement parts. The store maintains weekday hours from 7 AM to 4:30 PM with Saturday availability until noon, providing access to contractors who need parts for same-day repairs and installations.

The supplier differentiates itself through an extensive inventory spanning multiple equipment categories. Their catalog includes residential gas and oil furnaces, mini-split systems featuring variable capacity technology, geothermal units, and commercial packaged rooftop systems. They also stock specialty items such as evaporative coolers, generators, and through-the-wall condensing units that many standard retailers do not carry. The Milwaukee branch in particular offers Saturday morning hours specifically serving contractors who cannot visit during weekday business hours.

Customer reviews mention specific scenarios where the supplier proved invaluable. One contractor highlighted that Dustin assisted with a difficult parts order, praising the cross-referencing capability across major brands to locate uncommon components. Reviewers note that the supplier focuses on serving licensed contractors rather than homeowners, explaining that handling gas furnace installations without proper certification could create liability concerns for both the installer and the parts supplier. Chris Borner specifically mentioned the huge inventory and the ability to check stock across the Johnstone network.