In the fast-changing landscape of long-haul trucking, energy efficiency and environmental compliance are becoming central concerns for fleet operators and independent drivers alike. One of the most notable innovations addressing these challenges is the Electric Auxiliary Power Unit (APU) for trucks, a battery-driven climate control solution designed to replace traditional diesel-powered systems. A leading example of this technology is the electric APU system developed for the U.S. market by Corunclima, which is reshaping how drivers manage in-cab comfort during rest periods.