Sales Leader – Sustainable Systems
Trane Commercial North America

Charles Jelen, better known as Charlie, is a lead subject matter expert for Trane on energy efficiency, electrification and refrigerant management. With 15 years of experience in the HVAC and power systems industries, Charlie has built a career grounded in sustainability, application engineering, and systems modeling. As a sustainable system sales leader, he is dedicated to developing and expanding building and industrial systems that meet the needs of ambitious clients.

Charlie graduated from the University of Minnesota with a degree in mechanical engineering and has been with Trane since 2014. When he is not working, Charlie enjoys spending time with his family in La Crosse, Wisconsin.

Applications Engineer
Trane Commercial North America

Dan Gentry is an Applications Engineer at Trane. He joined the Trane team in 2018 after honing his skills for eight years at another local Wisconsin-based chiller manufacturer. But Dan's journey with Trane actually began much earlier—he first interned in the Technology Lab, working in the acoustic lab while attending school through 2008.

Dan's expertise is as cool as the systems he designs, focusing on chiller plants, heat recovery, and heat pump systems. He's all about making these systems reliable and efficient, ensuring they run smoothly and sustainably. A proud graduate of Ferris State University, Dan earned his bachelor’s degree in HVAC Engineering Technology in 2011 and is an active member of ASHRAE.

Dan is based in La Crosse, but in his free time can be found enjoying quality time with the family floating along the Mississippi River, or unwinding at their cozy cabin in the Upper Peninsula of Michigan.