Realize your lab sustainability initiatives with no compromise in ultra-low cooling performance

When considering the overall environmental impact of an ultra-low temperature freezer, our system provides the most environmentally sustainable solution in the industry–with no compromise in system reliability and performance. The Stirling Ultracold SU780XLE upright freezer provides new levels of lab sustainability by:

  • Using less than one third the electrical energy of standard, compressor-based ULT freezer technology, which use as much power as the average U.S. household.
  • Offering the first ULT cooling system in the U.S. to use EPA-approved 100% natural refrigerants
  • Using an environmentally-friendly foam insulation blowing agent and less raw materials in our freezers

The Stirling engine uses helium as the working fluid, about 10 grams, and a thermosiphon containing about 90 grams of ethane, which connects the engine to the interior of the freezer. Both helium and ethane are natural refrigerants and ethane is also a hydrocarbon refrigerant. Stirling Ultracold was the first manufacturer to have this EPA SNAP approval to use a hydrocarbon refrigerant. This combination of helium and ethane has less than 1/10,000 the global warming potential of the refrigerants used in conventional ULT freezers.


Lowest energy use. Best lab sustainability

According to the EPA ENERGY STAR®-certified Final Test Method results, our upright SU780XLE is the most energy-efficient ULT freezer, making it the best for lab sustainability. By using the lowest energy per cubic foot of storage (.29 kW/day/cu-ft) in the industry, we are reducing the overall carbon footprint needed to power a laboratory. Every time a facility replaces their old, inefficient standard compressor-based freezers with our SU780XLE freezers, they will see an average 70-75% reduction in their energy consumption.

Zero waste facility

All of our ultra-low temperature freezer models are made in a Zero Waste facility where we minimize waste, recycle and compost in order to divert material away from landfills or incineration. We dutifully monitor our waste stream and follow the Zero Waste International Alliance (ZWIA) definition of Zero Waste. Our Zero Waste principles and practices are posted throughout the facility and have been certified as a Gold Level business through the Ohio EPA’s Encouraging Environmental Excellence (E3) Program. The E3 program acknowledges an organization’s exceptional achievements in environmental stewardship. This is part of our commitment to the greater good of the environment and the long-term sustainability of our planet.


Real sustainability benefits that support climate action initiatives

The combined effects of energy savings and natural refrigerants have far less overall climate impact than cascade-compressor based freezers. During a typical ten-year lifespan, our freezers will produce about 30% of the CO2 during operation compared to legacy ULT freezers.

Achieving environmental sustainability and energy savings with Stirling freezers also reduces the cost of ownership, bringing financial savings over the operating life of the freezer.