Eberspaecher has introduced new thermal management systems for buses, focusing on energy efficiency, natural refrigerants, and cloud-based services. The portfolio includes the AC138 EVO and the expanded AC135 family, both compatible with various drive technologies and designed for different climate zones and vehicle sizes.
The AC138 EVO uses CO2 (R744) as a natural refrigerant and integrates patented heat pump technology with an energy recovery system and simplified air circuit. Series production began in mid-2025. Starting in 2026, the system will also support propane (R290) to improve performance in high ambient temperatures.
The AC135 range offers cooling capacities from 25 to 50 kW and includes both conventional and all-electric variants. Existing models serve midibuses, intercity buses, and coaches, with fully electric versions delivering 30–40 kW. High-capacity models (40–50 kW) and electric heat pumps (30–40 kW) will enter production in 2026. From that year, the AC135 will also be available with R290 refrigerant, responding to increasing regulatory restrictions on synthetic refrigerants and PFAS content in Europe.
The new Hydro Control System (HCS) enables centralized management of all thermal processes in the vehicle. It connects key components—such as high-voltage batteries and drive units—to the heating and cooling circuit, using waste heat to reduce battery load. This approach lowers electrical consumption by up to 23 percent and extends vehicle operating range. The compact HCS can be adapted to different vehicle layouts.
Eberspaecher’s E-Control module coordinates HVAC operations and links to the e-connected cloud platform. Over-the-air software updates, intelligent fault detection, and predictive maintenance tools enable real-time fleet monitoring and reduce workshop visits.
