Stirling Ultracold


Stirling Ultraguard PCM

Ultra-Low Freezers

Ultra-low temperature freezers

We were the first to bring revolutionary technology to -80°C ultra-low storage, that not only makes significant energy savings possible, but also enables true environmental sustainability. Our freezers were the first to use all natural refrigerants and our SU780XLE was the first ULT freezer to be ENERGY STAR® certified. We changed the industry by making real laboratory sustainability possible through our innovative free-piston Stirling engine.

ULT Freezer

The Stirling Ultracold SU780XLE is a reliable and energy-efficient upright ultra-low temperature (ULT) freezer.

ULT Freezer

The Stirling Ultracold SU105UE undercounter ultra-low temperature (ULT) freezer is ideal for bench-side personal storage or for use in areas where larger-volume ULTs are not suitable.

ULT Freezer

The ULT25NEU is the only truly portable ultra-low temperature (ULT) freezer available today for bringing cold chain sample and biologics storage to patients and remote sites.


Safeguard your biological materials from temperature excursions, no matter what, with Stirling Ultraguard.
Phase change material (PCM) bricks back up and extend -80°C to -60°C passive holdover time for up to eight hours inside the Stirling Ultracold ULT25NEU portable freezer.

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The Stirling high-efficiency engine design

We removed the compressors. You’re welcome. How we replaced the compressors in our ultra-low freezers with the free-piston Stirling engine — and why that’s a huge benefit for you.

Opening freezer door


Get in touch
with our
service team

For immediate assistance, please call us Monday
through Friday (8:00 am to 5:00 pm EST) at:

Service Phone: +1.740.274.7980


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