
Thermo King's Auxiliary Power Units (APUs) are designed to help tractor owners and fleet managers save money and meet environmental regulations. The TriPac APU consumes approximately 75% less fuel per hour than idling a tractor engine, which equates to about 2,500 gallons of fuel per year or 10,000 gallons over the typical length of tractor ownership. This significant fuel cost reduction is a primary advantage of the Thermo King APU, and it also helps to reduce engine wear and maintenance frequency.
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What You'll Learn

Thermo King Tri-Pac fuel consumption
The Thermo King Tri-Pac APU consumes approximately 75% less fuel per hour than idling a tractor engine. This amounts to a saving of about 2,500 gallons of fuel per year or 10,000 gallons over the typical length of tractor ownership. The fuel savings offered by the Tri-Pac APU are significant, especially for fleets running multiple tractors.
The Tri-Pac APU helps to reduce unnecessary engine idling, which in turn lowers fuel consumption. This also helps to reduce wear and tear on the tractor engine, increasing the resale value of the vehicle. In addition, the reduced fuel consumption contributes to lower greenhouse gas emissions, helping customers meet sustainability goals and environmental regulations.
The Thermo King Tri-Pac APU also offers TracKing telematics, which provide data on the unit's runtime hours, cabin temperature, and fuel tax reporting. This technology helps fleets calculate and share their climate contributions with customers, drivers, and communities.
The Tri-Pac APU is available in two different models to meet different emission regulations. One model is a 49-state Environmental Protection Agency (EPA) Tier 4 compliant solution for aftermarket installations. The second model includes a new aftertreatment device (ATD) that is 50-state compliant, meeting California Air Resource Board (CARB) and EPA Tier 4 requirements for new OEM or aftermarket installations.
The Thermo King Tri-Pac APU is designed to provide the same comfort and performance that customers expect, while also offering enhancements to reduce emissions, monitor unit performance, and increase profitability. It provides best-in-class 13,000 BTUs, allowing users to power appliances and charge devices, bringing the comforts of home on the road.
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Cost savings and resale value
The Thermo King APU offers significant cost savings by reducing fuel consumption during rest periods. Fuel costs are a major expense for truckers, and the APU helps to keep these costs low. For example, the TriPac APU consumes approximately 75% less fuel per hour than idling a tractor engine, resulting in savings of about 2,500 gallons of fuel per year or 10,000 gallons over the typical length of tractor ownership. This not only reduces operational expenses but also increases tractor uptime due to less frequent maintenance.
In addition to fuel savings, the resale value of tractors with APUs is also higher. The reduced engine hours and wear result in a faster and more profitable sale. The initial investment in an APU can be quickly recouped, usually within the first year of purchase, and the value continues through resale.
The Thermo King TriPac APU also offers new emission reduction technology, helping customers meet sustainability goals and comply with environmental regulations. The addition of ThermoLite solar panels further reduces fossil fuel emissions and engine run time.
The operational and environmental benefits of the Thermo King APU result in significant cost savings and a positive impact on resale value, making it a valuable investment for fleet managers and tractor owners.
Furthermore, the APU's ability to power appliances and charge devices enhances its overall value proposition. With a best-in-class 13,000 BTUs, the TriPac APU has ample capacity to meet the power needs of truckers, ensuring their home comforts on the road without the high fuel costs.
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$159.99 $219.99

Electric APU options
One electric APU option is the TriPac Envidia by Thermo King. This all-electric, battery-based APU system offers significant fuel savings and reduces maintenance costs by decreasing engine operation. With no diesel engine, the TriPac Envidia operates cleanly and quietly, meeting anti-idle and zero-emission regulations. It provides 7,500 BTUs/hr of heat, ensuring driver comfort, and offers various mounting options for customisation. Thermo King also offers a wide network of support with over 200 locations across North America for expert installation and service.
Another electric APU option is the Polar Fox E-APU, which offers a lithium battery-powered system for all makes and models of semi-trucks. This system provides cooling, heating, and power without idling, with real-time monitoring of battery health to minimise unexpected downtime. Polar Fox also highlights the simplicity of their system, which includes only two components: the battery and the A/C unit.
Electric APU Inc. offers another electric APU system that significantly decreases engine wear and tear and reduces fuel and maintenance costs caused by idling. They provide a 12-month financing option with no down payment, interest, or payments for the first 30 days, making it accessible to those with good credit. Their system can cool the truck for up to 36 hours, and with fuel savings from reduced idling, the system can pay for itself in 5-7 months.
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Reduced emissions
Thermo King's APUs, such as the TriPac APU, consume significantly less fuel per hour than an idling tractor engine. This reduction in fuel usage directly translates to reduced emissions.
The TriPac APU consumes approximately 75% less fuel per hour than idling a tractor engine. This amounts to a saving of about 2,500 gallons of fuel per year or 10,000 gallons over the typical length of tractor ownership. By reducing tractor engine runtime, the TriPac APU not only saves fuel but also reduces engine wear and maintenance frequency, keeping costs down and increasing tractor uptime.
The 3rd generation TriPac APU also includes new emission reduction technology and is compliant with environmental regulations, such as those set by the Environmental Protection Agency (EPA) and California Air Resources Board (CARB). Additionally, Thermo King offers ThermoLite solar panels that can be added to the TriPac APU to further reduce fossil fuel emissions and engine runtime.
The combination of reduced fuel consumption, improved engine efficiency, and supplementary solar power makes Thermo King's APUs a crucial component for fleets looking to reduce emissions, meet environmental regulations, and improve their sustainability practices.
Thermo King's APUs not only offer financial savings but also contribute to a more environmentally friendly transportation sector. With reduced emissions, fleets can lower their carbon footprint and play a key role in mitigating the environmental impact of road freight transportation. This makes Thermo King's APUs a smart choice for businesses aiming to balance profitability and environmental responsibility.
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Fuel consumption compared to idling engines
Thermo King's diesel TriPac APU consumes approximately 75% less fuel per hour than idling a tractor engine. This amounts to a saving of about 2,500 gallons of fuel per year or 10,000 gallons over the typical length of tractor ownership.
The fuel consumption of an APU varies depending on the power and cooling load, ranging from 0.1 to 1.1 gallons per hour. For instance, a TriPac APU user reported an average fuel consumption of 0.6 gallons per hour, which is significantly lower than that of an idling truck engine.
In contrast, an idling engine typically consumes 0.8 to 1 gallon of fuel per hour. This means that APUs, with their smaller engines, offer a more fuel-efficient alternative for maintaining temperature control in vehicles.
Additionally, electric APU options are also available, which eliminate the need for fuel entirely, further enhancing fuel savings and reducing greenhouse gas emissions. Thermo King's 3rd generation TriPac APU also includes emission reduction technology and the option of adding ThermoLite solar panels to further reduce fossil fuel emissions.
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Frequently asked questions
The fuel consumption of a Thermo King APU ranges from 0.1 to 1.1 gallons per hour. The exact amount depends on power and cooling load.
Thermo King APUs consume considerably less fuel per hour than an idling tractor engine. The TriPac APU, for example, uses approximately 75% less fuel.
Reduced fuel usage leads to cost savings and helps meet sustainability goals and environmental regulations. Lower fuel consumption also means fewer greenhouse gas emissions, which is better for the environment.
Yes, Thermo King offers solar panels that can supplement APU power and further reduce fossil fuel emissions. Electric APU options are also available, which eliminate the need for fuel entirely.











































