Thermo King expands all-electric, high-efficiency TE Series with bus heat pump for electric buses

Applying decades of Trane Technologies heat pump expertise, the TE Series advances sustainable transit while reducing emissions for public transit authorities.

MINNEAPOLIS, MN, September 3, 2025 – Thermo King, a leader in sustainable transport temperature control solutions and a strategic brand of global climate innovator Trane Technologies (NYSE: TT), today announced the introduction of the TE Series Heat Pump, which is designed to enhance the performance of battery-electric buses in moderate and colder climates. Part of Thermo King's all-electric, high-efficiency TE Series product line, the TE Series Heat Pump enables fleet operators to extend bus range, further reduce emissions and maintain passenger comfort, even in challenging conditions.

Extending electric bus range

Battery-electric buses have decarbonized the public transportation sector for over a decade, but traditional electric resistance heaters significantly reduce operating range by drawing substantial energy from vehicle batteries. The TE Series Heat Pump addresses this issue by applying Trane Technologies’ extensive expertise in heat pump technology, which has been applied across commercial buildings and homes, to public transit applications.

“This product is a critical step in continuing to make public transportation more efficient, reliable and eco-friendly, proving that decarbonization and operational excellence can go hand in hand," said Chris Tanaka, vice president of product management for Thermo King Americas. “Our TE Series Heat Pump represents the future of sustainable transit. By applying heat pump expertise, we are equipping fleet operators with innovative solutions that extend beyond emissions reduction alone.”

The TE Series Heat Pump’s ultra-efficient design extracts heat from ambient air rather than generating heat from battery power, resulting in up to 2.5 times more energy efficiency than conventional electric resistance heaters, which translates to more miles per charge. Buses equipped with the TE Series Heat Pump can achieve up to 50% more range at moderate temperatures (40°F) and up to 30% more range at colder temperatures (20°F) compared to those using electric resistance heaters[1].

Improving electric bus battery capacity

The system effectively keeps passengers warm as ambient temperatures drop to approximately 20°F without the need for backup heating. In colder climates requiring auxiliary heat, the TE Series Heat Pump allows for extended bus routes and reduced reliance on battery recharging. This not only decreases the frequency of recharges but also minimizes emissions at the power source.

The TE Series Heat Pump builds on the consistency of Thermo King’s existing TE Series product line, using familiar control strategies and operational modes that require minimal additional training for technicians or operators. Automated comfort systems handle heating, auxiliary heating and defrost modes internally, which reduces manual steps for drivers and prioritizes passenger safety for year-round reliability.

Reducing bus carbon emissions

Unlike diesel heaters, the TE Series Heat Pump produces no direct emissions, and its efficient energy use minimizes indirect emissions tied to electricity generation, making it a low-carbon, sustainable solution for transit authorities and bus manufacturers committed to maximizing decarbonization while delivering reliable, on-time service to their communities.

Transit professionals attending APTA TRANSform in Boston are invited to learn more about the TE Series Heat Pump and speak with Thermo King experts at Booth #910.

For more information about the TE Series Heat Pump and the TE Series, visit www.thermoking.com or contact your local Thermo King dealer.

About Thermo King

Thermo King – by Trane Technologies (NYSE: TT), a global climate innovator – is a worldwide leader in sustainable transport climate control solutions. Thermo King has been providing transport temperature control solutions for a variety of applications, including trailers, truck bodies, buses, air, shipboard containers and railway cars since 1938. For more information, visit thermoking.com or tranetechnologies.com.