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Thermo King TriPac Evolution (diesel APU)

Thermo King (Trane Technologies) · Apu · Diesel APU (auxiliary power unit)

Class 8 In production
Apu
Manufacturer
Thermo King (Trane Technologies)
Category
Apu
Subtype
Diesel APU (auxiliary power unit)
Class
Class 8
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What this component does

The Thermo King TriPac Evolution is one of the dominant diesel APUs (Auxiliary Power Units) for Class 8 sleeper-cab trucks. APUs provide cab heating, cooling, and 12V/110V electrical power for the driver's sleeper berth without running the truck's main engine. Anti-idling regulations in most US states + California ACT make APUs essentially mandatory for over-the-road operations. The TriPac Evolution holds approximately 35-40% APU market share, competing with Carrier ComfortPro and Idle Free. Saves fleets 1-2 gallons of diesel per hour of idle time vs running the main engine.

Specifications
Manufacturer
Thermo King (Trane Technologies)
Category
Apu
Subtype
Diesel APU (auxiliary power unit)
Truck class
Class 8
Production
2010–present
Applications
Sleeper cab driver comfort — heating, cooling, electrical power without idling main engine
Design and engineering

Small diesel engine (1-1.5 L typical) mounted in the truck's frame. Drives a generator for 12V (battery charging) and 110V (cab outlets, microwave, TV). Refrigerant-based cabin climate control (cooling) + diesel-fired bunk heater (heating). Independent of main engine.

Generations
  • TriPac Evolution Original (2010–2018)
    Launch.
  • TriPac Evolution with EPA Tier 4 Final (2019–present)
    Compliant with EPA Tier 4 emissions, refined controls, DEF integration.
Reliability and longevity

Strong reliability. 12,000-15,000 operating hours typical service life before major overhaul.

Common problems

Diesel engine wear at high hours (similar to main engine — needs oil/filter PM). EPA Tier 4 emissions complexity. APU theft from parked trucks is a recurring fleet problem.

Maintenance schedule

Oil/filter every 750-1,250 operating hours (Thermo King schedule). Annual PM check. EPA Tier 4 DEF top-up.

Pros and cons

Pros

  • ✓Industry-standard APU choice
  • ✓Saves 1-2 gal/hour vs main engine idle
  • ✓Meets state anti-idling rules
  • ✓Thermo King dealer network

Cons

  • !Upfront cost $9,000-13,000 installed
  • !Adds ~400 lb to truck weight
  • !EPA Tier 4 emissions service complexity
  • !APU theft risk
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Related

Frequently Asked Questions

What is an APU?
APU (Auxiliary Power Unit) is a small auxiliary engine or battery system mounted on a Class 8 sleeper-cab tractor that provides cab heating, air conditioning, and 110V electrical power without running the truck's main engine. The Thermo King TriPac Evolution is one of the dominant diesel APUs (Auxiliary Power Units) for Class 8 sleeper-cab trucks. APUs provide cab heating, cooling, and 12V/110V electrical power for the driver's sleeper berth without running the truck's main engine. Anti-idling regulations in most US states + California ACT make APUs essentially mandator
How much does an APU save in fuel?
A diesel main engine consumes 1.5-2.5 gallons per hour at idle. A diesel APU consumes 0.2-0.4 gallons per hour — saving 1.5-2 gal/hour. At \$3.50/gallon diesel and 1,500-2,000 hours of annual idle time, an APU saves $5,250-\$14,000 per year per truck. Payback period: 8-24 months depending on usage. Electric APUs save additional fuel because they consume zero diesel during operation (battery is charged while driving).
Is an APU required by law?
No — APUs are not federally required. However: most US states have anti-idling regulations limiting how long a truck can idle its main engine while parked (typical limit 5-30 minutes depending on state). California, Texas, New York have the strictest rules. APUs provide the cab climate control that anti-idling rules would otherwise eliminate. Many fleets and owner-operators consider APUs essentially mandatory for over-the-road sleeper-cab operations.
How much does an APU cost?
New diesel APU (Thermo King TriPac, Carrier ComfortPro): \$9,000-\$13,000 installed. New battery-electric APU (Idle Free, EV-eAUT factory-fit): \$8,000-\$15,000 — slightly cheaper now that battery costs have come down. Diesel-fired bunk heater (Espar Airtronic D2 — heat only, no A/C): \$1,500-\$2,500. Used APUs (5-year-old): 40-55% of original price. Theft is a recurring fleet problem — APUs are easy to steal from parked trucks and have a strong used market.
How long does an APU last?
Diesel APU service life: 12,000-15,000 operating hours before major overhaul. Battery-electric APU: 5-8 years before battery degradation requires replacement ($3,000-$6,000). At 1,500-2,000 hours per year, diesel APUs last 6-10 years before major service; electric APUs last 5-8 years before battery replacement. Both require regular PM.
Diesel APU vs electric APU?
Diesel APU (TriPac, ComfortPro, RigMaster): Unlimited duration, works in any climate, mature technology. Drawbacks: EPA Tier 4 emissions complexity, \$0.20-0.40/hour diesel cost, ~400 lb weight, theft target. Electric APU (Idle Free Lithium, OEM factory-fit): Zero emissions, zero fuel cost, quieter, lower maintenance. Drawbacks: 8-10 hour duration, cold-weather range limits, battery replacement expensive at end-of-life, requires depot 110V/3-phase for full recharge. California ACT mandates and emissions trends favor electric for long-term fleet planning.

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