If you work in Biology, BioE, Chemistry, or even Chem or MechE, chances are that your lab has an Ultra Low Temperature Freezer (ULT), often referred to as “Minus 80”s due to the fact that in recent decades they have been standardized to a set point of -80 Centrigrade.

These behemoths keep your samples cool and protected, but that comes at a cost. The average compressor-based ULT uses 14,000 kwh per year - that’s as much as a standard family home in the United States!

Read about how the Prather Lab in ChemE was featured in ACS for chilling up their ULT Freezers!


As mentioned above, just because you think of a ULT as being “Minus80” certainly does NOT mean that your samples need to be kept that cold!

Extensive research has been done internationally to prove that the extra 10C provides no benefit to your samples, yet uses up to 30% more energy than setting your freezer to -70C.

Biogen keeps most of its samples at -70C, and the University of Colorado had over 50% of its ULTs on campus at this setpoint!


Older models of ULTs, like many electric appliances, use considerably more energy to stay at temperature than their new, EnergyStar or compressor-less counterparts.

MIT has partnered with MassSave and Eversource to offer cash incentives to labs who purchase newer appliances that reduce their plugload. DOWNLOAD the rebate request form here to start the process of getting money back into your lab’s pockets, and reduce your energy impact!

Application for ULT Freezer Rebate

This form can be used for Replacement purchases, New purchases, or Consolidations



It’s very possible your lab keeps an extra ULT around for back up, or has multiple ULTs running with only 50% capacity. Not only does a poorly organized freezer mean wasted space, but your compressor will actually thank you for filling in those empty spaces! The more dead space that a ULT has to keep cold, the harder it has to work - consider consolidation, or offer the space to neighboring labs in need!

Join the freezer challenge!

This project “promotes sample accessibility, sample integrity, reduced costs, and energy efficiency by harnessing a spirit of competition within and between laboratories. Challenge participants use well-evidenced criteria and best practices that support science quality and resilience while minimizing total costs and environmental impacts of sample storage.”