Therma-Start On-Highway


On Highway Idle Reduction

  • Reduce idle time by 70%
  • Reduce fuel consumption by 70%
  • Reduce carbon emissions by 70%
  • Constantly monitors all critical systems


Therma-Start™ is a non-invasive retrofit start-stop system that easily installs on diesel-powered vehicles and equipment. The system eliminates unnecessary idling, saves on fuel consumption, extends oil change intervals and saves on maintenance costs. The latest in Start/Stop technology, Therma-Start is the definitive way to drastically reduce and manage operating costs while achieving major emissions reductions.

ThermaStart™ acts as an auto start/stop control system that does not intrude into the OEM engine data system but rather operates as a Virtual Key Switch, paralleling the existing ignition key switch and duplicating its functions. ThermaStart™ monitors battery condition, ambient temperature, engine block temperature and air pressure to make decisions based on programmed parameters to either start-up or shut down an engine. Idle reduction results are verified by on-board data logging.

ThermaStart™ Documentation



Therma-Start™ is constantly monitoring the engine block temperature, battery voltage, and air brake system pressure. When the block temperature drops to a pre-set point, the engine automatically starts. Therma-Start™ is programmed to go through a safety signaling delay before initiating each start-up cycle. When the engine block resumes optimal temperature, Therma-Start™ signals the engine to automatically shut down. Therma-Start™ also continuously monitors battery condition so a start-up can be initiated if a battery is losing charge due to cold weather extremes. Operators can confidently walk away from their machines knowing that Therma-Start™ is in charge!


Using a Kenworth W900 class 8 truck for example the following savings were realized once ThermaStart was installed:

  • Reduced idle time by 70% – from 10 hours down to 3.1 hours per shift
  • Reduced fuel consumption by 70% – from 10 Gals (38L) down to 3 Gals (11.4L) per shift
  • Reduced carbon emissions by 70% – from 227 lbs (105 kg’s) of Co2 down to 66 lbs (31.5 kg’s) of Co2 per shift


In this example, the payback from fuel saving is accomplished in a very short time! When you also factor in significantly extended maintenance intervals (ie. Oil Change / Service) along with greatly reduced wear and tear your payback escalates dramatically.

Therma-Start – Business Case

Therma-Start™ (On-Highway) Cost-Benefit Analysis

Installed On: Kenworth W900 Class 8 Highway Truck:

Application: 10hr overnight idling
Average Price :
Install Cost:

Installed Cost : $5,500

Life Cycle Operating Costs without ThermaStart:

Cold weather operating months (Nov-Mar) = 5 months x 30 days x 10hrs/day = 1,500 idle hours x $4.50/hour = 5 Month Life Cycle Operating Cost of $6,750 (includes fuel, maintenance and depreciation)

Life Cycle Operating Costs with ThermaStart:

70% reduction in idling hours = 450 idle hours x $4.50/hour = 5 Month Life Cycle Operating Cost of $2,025 (includes fuel, maintenance and depreciation)

 5-Month savings with Therma-Start = $4,725

Payback period: 7 winter months