Stirling Ultracold revolutionized ULT storage in 2010 with the introduction of the free-piston Stirling engine. Today, the Stirling VAULT100™ is raising the bar even higher with unsurpassed temperature uniformity and stability of +/-3°C. Built for uncompromising reliability and sustainability that doesn’t sacrifice performance, Stirling’s ULT freezers require less maintenance, use less energy, and have a larger storage capacity than similar compressor-based units. Stirling continues to drive industry-changing innovations that make positive impacts on science, our world, and your bottom line.