The World Leader in Free-Piston Stirling Engines and Cryocoolers

Welcome to Sunpower Inc.

Sunpower is the world leader in free-piston Stirling technology. Our reputation for producing reliable and efficient Stirling engines and cryocoolers is known world-wide.

Sunpower’s engineering services include prototype design, development and fabrication of free-piston Stirling engines. The CryoTel® line of cryocoolers has outstanding performance, manufacturing accuracy, and quality. We invite you to contact us for more information about our services or products.



    For over 15 years Sunpower’s M77 cryocooler has cooled Germanium detectors continuously aboard the RHESSI satellite to study solar flares. It was launched on February 5, 2002. Thanks to its longevity and the data the mission has provided the science community, RHESSI is continually one of NASA’s highest rated scientific missions. The original mission was planned for 6 months of study. Read More