may not be a household name in the U.S.—yet—but for those in the know, this Italy-based HVAC manufacturer represents the future of energy-efficient heating and cooling. With a North American headquarters and warehouse in Evansville, Indiana, Robur specializes in gas-fired ammonia absorption technology designed to reduce electricity use, lower environmental impact, and deliver long-term reliability for a wide range of applications—from manufacturing to multi-residential housing.
“We’re one of the few manufacturers using an environmentally friendly refrigerant like ammonia,” explains Frank Hoon a U.S.-based representative for Robur. “Most companies are still using synthetic refrigerants that harm the atmosphere. Our approach is cleaner and more efficient.”
Gas-Fired Absorption Technology: A Smarter Way to Heat and Cool
At the heart of Robur’s product line are its gas-fired ammonia absorption heat pumps and chillers. While traditional HVAC systems rely heavily on electricity, Robur’s units use natural gas or propane to power a sealed heat exchanger filled with ammonia. The ammonia acts as the refrigerant, transferring thermal energy to chill water to around 35–38°F. That chilled water can then be used for environmental cooling or for industrial processes.
The key distinction? Heat pumps can also provide heating, while chillers focus solely on cooling. “Our chillers are often used in high-heat manufacturing environments where cooling is a year-round necessity,” says Hoon. “If you don’t need heat, the chiller alone is a more economical solution. But the heat pump gives you flexibility.”
Built to Last—with Simplicity
Robur’s technology isn’t just efficient—it’s dependable. With fewer moving parts than conventional HVAC systems, Robur units are engineered for durability. In fact, some of the company’s earliest systems—dating back to the 1960s—are still in operation today.
“It’s a sealed system,” Hoon notes. “We don’t cut corners on materials. We use quality components, nothing from low-cost suppliers. And because there aren’t many moving parts, they just last.”
Robur Serves a Growing Need in North America
While Robur’s products are already in use worldwide, certain regions have become early adopters of the company’s innovative approach—particularly Canada, where aggressive decarbonization goals have led to widespread adoption in multi-residential buildings and senior living facilities.
In the U.S., Hoon says the medical and manufacturing sectors are showing the most interest, especially in settings where chilled water is used for comfort or process cooling. Robur’s modular design is another draw: rather than overinvesting in a single large system, customers can scale up gradually with smaller, stackable units.
“That modularity gives us a big advantage,” Hoon adds. “Pharmaceutical and industrial facilities don’t have to gamble on oversized chillers. They can grow the system as their needs grow.”
Decarbonization Without Overloading the Grid
As much of the HVAC industry pushes toward electrification, Robur’s gas-powered approach offers an alternative path—one that’s both energy-efficient and more realistic given the state of U.S. infrastructure.
“Electric HVAC systems put a heavy load on the grid,” Hoon explains. “But natural gas infrastructure is already in place, and our units use a quarter of the electricity of traditional systems. That’s a big win for areas facing power constraints.”
Robur's U.S. Support, Distribution, and Training
Although manufacturing remains in Italy, Robur’s U.S. operations are strategically designed to support distributors and customers. The company stocks approximately 300 units in Indiana at all times and offers technical support and contractor training to ensure proper installation and maintenance.
“When a contractor is struggling or a customer says something isn’t working quite right, we can troubleshoot it. Most of the time, it’s an install issue,” says Hoon. “That’s why we also provide training onsite at our Indiana facility.”
And when it comes to supporting distributor partners, Robur goes the extra mile—literally. “I go out on sales calls with our distributors,” Hoon shares. “It helps build trust, and it helps customers understand the value and performance of what we’re offering.”
Coward Environmental Systems, Inc. and Robur Have a Lot in Common
Both companies are committed to environmentally responsible solutions and long-term efficiency. “We’re on the same path,” says Hoon. “We’re both looking for ways to reduce energy use, lower environmental impact, and offer smarter HVAC options to our customers.”
As the pressure grows to decarbonize and improve building performance, Robur’s efficient, modular, and environmentally conscious systems are poised to play a larger role in the U.S. HVAC market. Contact CESI to learn more.
