Ultra low laboratory freezer selection: sizing an ultra low temperature freezer, siting and heat rejection, and the alarm and failure plan that is the real purchase in an ultra low lab freezer, in an ultra-low freezer bank, across ultra low freezers and ultra-low freezers generally, and in laboratory freezers of every kind

The purchase, and the plan around it

1. Upright or chest. Uprights are easier to organise and access and lose more cold air when opened. Chest freezers hold temperature better during opening and door events and are harder to search. For frequently accessed inventories the upright usually wins on the time spent with the door open.
2. Heat rejection and the room. These units pump a great deal of heat into the room, and a row of them will defeat ordinary air conditioning. Establish the heat load and the room's capacity before ordering, because a warm room shortens compressor life and raises the failure rate of everything in the row.
3. Power, circuits and backup. Check the circuit rating and whether the unit sits on backup power. Decide deliberately which freezers are on generator or uninterruptible supply, because in a real outage the answer is whichever ones somebody thought about in advance.
4. Alarms that reach a person. An independent monitoring system that alerts a named person by a route they will actually receive, with a documented escalation, is the part that saves samples. A freezer's own beeper in an empty building at the weekend saves nothing.
5. The written failure plan. Where samples go, who moves them, who has keys, where dry ice comes from at two in the morning, and what spare capacity exists. Keep the plan where somebody who is not you can find it, and keep enough spare capacity in the building to take one freezer's contents.

Running cost and temperature set point

These are among the largest electrical loads in a laboratory building, and running cost varies substantially between models. Newer designs with variable speed compressors and better insulation are meaningfully cheaper to run, which matters over a long service life.

A warmer set point within the accepted range reduces energy use and compressor stress, and many laboratories have moved to one after checking their sample types tolerate it. It is a decision to take deliberately with a record, not one to drift into.

Organisation is what makes capacity

Most laboratories discover spare capacity by clearing out material nobody can identify. A registered inventory with locations, an expiry and retention policy and a periodic review usually defers a freezer purchase entirely.

Keep the door open for as little time as possible: a mapped inventory and racks pulled in one movement protect the contents more than any specification on the quotation.

Common questions

Upright or chest ultra-low freezer?

Uprights are easier to organise and access but lose more cold air on opening; chest units hold temperature better and are harder to search. For frequently accessed inventories the upright usually wins overall.

What should I check about the room?

Heat rejection and the room's cooling capacity, the circuit rating, and whether the unit will sit on backup power. A row of freezers in an under-cooled room shortens the life of every unit in it.

What kind of alarm do I need?

Independent monitoring that alerts a named person by a route they will actually receive, with documented escalation. A built-in beeper in an empty building at the weekend protects nothing.

What should the failure plan say?

Where samples go, who moves them, who has access, where dry ice comes from out of hours, and what spare capacity exists. Keep it where someone other than you can find it.

Browse by service class

• Compare Gene synthesis on advertised prices