“It started with coal fired boilers in East Harlem.”

Oswald Supply’s history stretches back more than a century. In 1923, Henry C. Oswald and his brother opened a small supply business serving New York City’s heating industry. At the time, much of the city relied on coal-fired boilers, and keeping buildings heated required constant maintenance, replacement parts, and hands on expertise.

Over the next hundred years, the company evolved alongside the city itself. Coal systems gave way to oil, oil transitioned to gas, and new technologies continually reshaped the heating industry. Yet older systems rarely disappeared completely.

“Manufacturers didn’t want to deal with one-off replacement parts anymore,” Robert explains. “But those systems were still running in buildings all over the city.”

While manufacturers moved on, Oswald Supply continued supporting aging equipment, developing deep expertise in obsolete systems and hard-to-find parts that many others no longer carried. “We’re dealing with technology from every era all at once,” Bob says. “There are buildings still running equipment that’s older than most people realize.”

That willingness to support legacy systems became one of the company’s defining strengths. Contractors, building operators, municipalities, and maintenance teams came to rely on Oswald Supply for discontinued parts, technical guidance, and solutions to problems that few others could solve. Today, that history is visible throughout the company’s ever-expanding warehouse, where decades of heating technology reflect generations of New York City buildings and infrastructure.

“We became the place people called when nobody else had the answer.”

Over the years, the business expanded significantly. Bob estimates the company grew roughly three to five times larger as inventory, manufacturing capabilities, and national reach continued to expand. In 2005, Oswald Supply relocated from Manhattan to Hunts Point in the Bronx, creating more room for inventory and operations while remaining closely connected to the city’s building trades.

When Robert joined the business in 2009 as the fourth generation at Oswald Supply, modernization became a major focus. “I organized and digitized all of my father’s and grandfather’s notes,” Robert says. “There was so much knowledge that only existed in file cabinets and handwritten records.”

Those records contained decades of technical knowledge tied to discontinued boiler systems, replacement parts, manufacturer changes, measurements, customer histories, and solutions to highly specific problems that often were not documented anywhere else. Much of that knowledge existed only because previous generations at Oswald Supply had spent years troubleshooting systems and carefully recording what worked.

By digitizing those records and integrating them into the company’s internal systems and website, Robert helped preserve generations of institutional knowledge while making it accessible to customers across the country. “We wanted the website to feel like the counter experience,” Robert explains. “You’re still talking to real people who know the products.”

“Every generation brought something new to the business.”

Today, Oswald Supply operates in an industry that looks dramatically different from the one H.C. Oswald entered more than a century ago. Technology has changed how buildings operate, how customers purchase products, and how information moves throughout the industry.

Yet Bob and Robert believe the company’s longevity comes from balancing modernization with experience, relationships, and expertise accumulated over generations. For Robert, preserving the company’s knowledge base remains one of the most important priorities moving forward. Their historical understanding of heating systems simply cannot be replicated elsewhere. It comes from decades of accumulated experience, meticulous record-keeping, and a commitment to helping customers keep complex systems running.

“There’s a trust there,” Robert says. “People know that when they call us, they’re going to get somebody who actually understands what they’re working on.”

After more than a century in business, Oswald Supply continues to evolve while remaining deeply connected to the history of New York’s buildings, infrastructure, and trades. Shaped by generations of problem-solvers, the company has long been a trusted resource for complex challenges and continues to answer the call when others don’t have the solution.