Walk into any of Johnstone Supply's 450-plus branches and the scene is unremarkable in the best way: a counter, a warehouse of compressors and coils, a contractor in a work shirt picking up a capacitor before an afternoon service call. There is nothing here that looks like a $4.5 billion business. And yet that is roughly what this Portland, Oregon company does in annual sales - quietly, one part at a time, keeping the heating and cooling systems of North America running.
The name is the first clue that this is an old story. "Johnstone" is not a person. It is a splice of two surnames - Johnson and Stone - who opened a single refrigeration supply store in 1953. Stone was a refrigeration contractor, so the shop leaned into cold: parts for the equipment that kept walk-in coolers and commercial iceboxes working. Seven decades later, the company sells nearly everything a modern climate-control contractor could need, but the founding logic never changed. Sell the trade the exact part it needs, when it needs it, close to where it works.
01A distributor, not a manufacturer
Johnstone Supply does not build furnaces or air conditioners. It is a wholesale distributor - the middle layer of the HVACR economy that sits between the manufacturers who make equipment and the contractors who install and repair it. Its inventory spans gas and oil furnaces, air conditioning units, heat pumps, mini-split and split systems, compressors, evaporator coils, motors, pressure switches, electrical controls, refrigerant accessories, connected thermostats, zoning systems, air filtration, dehumidification, water heaters and the hand tools and test instruments technicians carry to every job.
A distributor's real product is not any single box on the shelf - it is availability. A contractor whose customer has no heat in January cannot wait a week for a part to ship from a factory. So the company runs six regional distribution centers feeding hundreds of local branches, which is less a catalog and more a promise: the part is nearby, in stock and ready today. It also maintains an extensive cross-reference system for new, existing and obsolete parts across all major brands, which matters more than it sounds. Half of field service work is figuring out what fits a fifteen-year-old unit whose original component is no longer made.
02The customers used to own the company
Here is the part of the story that makes it worth telling. For roughly four decades, the people buying parts from Johnstone Supply also owned it. When the founder-era leader neared retirement, he chose not to sell the business to a national chain. Instead, in 1981, he turned it into a cooperative. Each store owner would run their own independent business, but the stores would band together - pooling purchasing, warehousing, merchandising, marketing and financial reporting under a shared corporate office. The co-op launched with 32 member stores.
It is a deceptively powerful model. Independent operators usually lose to national chains on price because they cannot buy in bulk. The co-op erased that disadvantage. A small store in one state got the buying power of the entire network, while keeping the local ownership and judgment that big-box distribution tends to flatten. That structure - independence plus scale - is why 32 stores became hundreds.
03From co-op to company
In September 2021, members approved a definitive conversion agreement with Redwood Capital Investments, a Baltimore-based permanent holding company. That November, the cooperative was converted into Johnstone Supply, LLC. The 40-year co-op era ended, and the network today runs as a mix of independently owned and company-owned locations under a single corporate structure. The move traded some of the pure member-ownership model for the capital and centralization that a business of this size increasingly needs.
What did not change was the customer. The company still exists to serve contractors, and its scale is now firmly in the top tier of North American HVACR distribution.
04The competitive map
HVAC distribution is a large, fragmented market, and Johnstone is one of a handful of names that operate at continental scale. It competes with publicly traded Watsco, with Ferguson's HVAC arm, with Winsupply, Baker Distributing, Gustave A. Larson and with the distribution channels that equipment manufacturers run themselves. Against manufacturer-owned channels, Johnstone's edge is brand-neutrality: it cross-references and stocks parts for all major brands rather than steering a contractor toward one line. Against the giants, its history as a network of locally owned stores gives it a counter-heavy, service-first culture.
05It teaches the trade
A quieter piece of the business is education. Through Johnstone University, the company offers hundreds of classes - including NATE-certified courses - alongside hands-on product training at many branches. For a distributor, teaching the trade is a smart moat: a technician who learned a diagnostic method or a new product line at your counter tends to keep buying from your counter. It also addresses a real industry problem, which is that skilled HVAC labor is scarce and the equipment keeps getting more complex, from connected thermostats to energy-recovery ventilation and geothermal systems.
06The unglamorous engine
Air conditioning and heating feel automatic until they stop. Behind that reliability is a supply chain that has to put the right compressor, coil or control board within reach of a contractor on a deadline. Johnstone Supply is a large node on that graph - a 70-year-old business that never pivoted, never rebranded every eighteen months, and never became a household name, precisely because its job is to be invisible and dependable. It is a reminder that some of the most durable companies are the ones nobody posts about: boring category, essential function, compounded patiently for decades.
For contractors, the practical value is simple. One network to source equipment, replacement parts for brands old and new, the tools to install them and the training to stay current - available locally, most of it same day. For the broader market, Johnstone is a case study in two ideas that rarely get celebrated together: shared buying power among independents, and the quiet compounding of a distribution business that just keeps showing up.