Originally published: 10/1/2025
Lennox, announced that its commercial cold climate heat pump rooftop unit (RTU) was the first to successfully complete the laboratory validation for commercial unitary equipment in the 15-25 tons category in the U.S. Department of Energy's (DOE) Commercial Building HVAC Technology Challenge.
Designed to produce innovative HVAC technology, this accomplishment helps provide customers with access to high-efficiency heat pumps in cold climates, improving performance and solving long-standing defrost limitations for greater comfort and reliability. According to the DOE, commercial building space conditioning accounts for approximately 40% of commercial energy use in the United States.
Led by its Texas Product Development and Research laboratory, Lennox developed a cold climate heat pump RTU that meets and, in many cases, exceeds the stringent performance requirements of the challenge, as validated in an independent lab by the DOE and the National Renewable Energy Laboratory (NREL).
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