The Freezer Challenge was concluded, but you can get support on implementing the changes any time. In this document you will find references on why -70ºC is safe. If you wish to:
1. Check what is in your freezers and discard any materials that are no longer of use. In the process, make sure you store samples at high density and avoid half-filled boxes. Keep track of the boxes you discard for points!
2. After this clean-up, consider whether it is possible to more efficiently store your materials, ensuring freezers are full. This may involve sharing freezers with other groups and thereby reducing the numbers of freezers that are in use. Also within your lab, there may be possibilities to retire old freezers. Where appropriate, make use of the unique offer to replace two old freezers (however old!) with one new energy-efficient freezer free of charge. Details can be found here.
3. For the ULT-freezers still in use: change the temperature to -70°C unless there are very good reasons to keep it at -80°C. We can offer support in changing the temperature and alarm settings (-65°C as lower limit in the alarm settings is recommended).
4. Develop or optimize your sample inventory system to improve the efficient storage and retrieval of samples. We also recommend you make use of the Radboudumc support team for annual freezer maintenance.
Remember: discarding obsolete stocks, defrosting periodically, retiring old freezers and changing the temperature are all beneficial. There are green options for every lab, sample and situation.