We Set the Precedent for Sustainable Solutions

Since 2013, the Precedent® S-Series reefer unit has delivered unmatched Evergreen CARB compliant solutions and has been a proven TRU you rely on to deliver temperature-critical products across the country.


Celebrating 10 Years of the Precedent® S-Series Reefer Unit

We may be celebrating the 10th anniversary of the Precedent S-Series reefer unit, but we are far from resting. At Thermo King, we are celebrating our history of investing in innovative and sustainable solutions that provide peace of mind and confidence for our customers. 

The S-Series was the first reefer unit in the refrigerated transportation industry to achieve Evergreen CARB and EPA Tier 4 engine compliance. Ten years later, it's still a proven solution that meets the strictest emission regulations without modifications like a diesel particulate filter (DPF). 

Your trust in us over the last decade for CARB-compliant solutions keeps pushing us to innovate and develop new solutions for you.

Precedent Decade Celebration Landing Page Innovation Updated 2.0

Innovative Thinking Is What Drives Us

When you're committed to providing your customers with reliable TRU solutions, smart thinking and innovation are a must. Since launching the Precedent S-Series reefer unit, we've spent the last decade innovating to provide reliable, proven and industry leading technology. From more multi-temp options, solar integration and being the first TRU manufacturer to switch to a lower global warming potential (GWP) refrigerant, we are proud of the evolution of the Precedent S-Series portfolio.

We promise to continually provide new, reliable solutions that keep improving and pushing the boundaries of the transport refrigeration industry.


The new Precedent S-750i trailer refrigeration unit introduces three key features: 

  • Three-speed engine

  • Next-generation control system

  • Diesel-electric architecture optimized for shore power integration 

Precedent Decade Celebration Landing Page Sustainability

Keeping Sustainability at the Forefront

Sharing a commitment to sustainability with our customers is what drives us forward. By purchasing an Evergreen CARB compliant unit, customers can rest assured that they are meeting the strictest Particulate Matter, NOx regulations, as well as maximizing their fuel usage. Since the Precedent S-Series reefer unit launched in 2013, customers have avoided more than 6 million metric tons of CO2 emissions. This saves the equivalent emissions of 600 million gallons of diesel fuel.

While transformational products like the Precedent S-Series help you make a positive impact on the environment, we also are committed to broader global climate goals. Through Trane Technologies’ Gigaton Challenge, we are committed to reducing our customer’s greenhouse gas emissions by 1 billion metric tons.

​​​Learn more about our sustainability commitments and how we are helping our customers deploy solutions that reduce emissions.

Precedent Decade Celebration Landing Page CARB Regulations

Prepare for the Changing CARB Regulations

The California Air Resources Board (CARB) 2022 Amendments are taking effect as early as December 31, 2022. If you operate in California, it is important to understand what is changing so you can effectively manage your fleet. 

You can read ​CARB's 2022 Amendments to the TRU ATCM or download our ​​CARB Guide

We make it a priority to stay ahead of regulations. You can have peace of mind knowing that our S-Series units are compliant with the upcoming changes.

Ross Nelsonn on Black and Blue Honeycomb Background

Insights from an Engineer

How do you design a reefer unit that meets the most stringent diesel engine emissions standards and offers the lowest total cost of ownership possible? We went back to the beginning to learn more about the engineering behind the S-Series with Engineering Leader for Truck, Trailer and Rail, Ross Nelson. Read the full interview for more insights on the S-Series and how our Precedent line has evolved.

Get More Information on the Precedent® S-Series

Anti Spam message

Your information will only be used for this inquiry. For more information, please read our privacy policy.