Standard, Low Temperature and Ultra-Low Chest Freezers From 1.7 to 30 Cubic Feet
Chest freezers hold temperature better than uprights because cold air is denser than warm air and stays in the box when the lid opens, which is why they dominate long-term sample archiving and ultra-low storage. This collection spans three temperature tiers, from standard -25°C through -40°C low temperature down to -86°C ultra-low, in capacities from a 1.7 cu ft mini through 30 cu ft.
That physics point is the whole argument for the format. Open an upright freezer and the cold air pours out of the bottom while room air flows in at the top, so the cabinet has to work hard to recover. Open a chest freezer and the cold air sits there. During a power failure the same effect applies: a well-filled chest freezer holds usable temperature considerably longer than an upright of the same rating.
The trade-off is access. Finding one box at the bottom of a full chest freezer means lifting out everything above it, which is why chest freezers suit archives and uprights suit daily working stock. Choose by how often you go in, not by capacity alone.
→ Part of Commercial Refrigeration. Also see Ultra-Low & Cryogenic, -86°C ULT Freezers, Laboratory Freezers and Compact & Specialty Refrigeration.
Which Temperature Tier Do You Need?
Three tiers cover essentially all chest freezer applications, and the right one is determined by what you store and for how long, not by preference.
| Tier | Range | Typical Use |
|---|---|---|
| Standard freezing | Around -25°C to -15°C | General laboratory and clinical frozen storage, food service |
| Low temperature | -34°C to -45°C | Longer-term sample storage, certain reagents and biologicals |
| Ultra-low (ULT) | Down to -86°C | Cell lines, enzymes, nucleic acids, long-term biospecimen archive |
So-Low's model naming makes the tier explicit once you know it. CH25 is a -25°C chest freezer, CH40 is -40°C, and the C40, NC40 and VSC40 families are ultra-low chest units. ScienTemp uses the target temperature as the prefix: the 34 series runs to -34°C, the 40 series to -40°C, and the 43 and 45 series deeper still.
Standard and Low Temperature Chest Freezers
Standard -25°C
So-Low's CH25 range covers 3.5 cu ft mini, 5, 9, 15, 20 and 25 cu ft. The ABS premier laboratory chest freezer at 15 cu ft covers the same band.
Low temperature -34°C to -45°C
ScienTemp's range is unusually granular here, which helps when you are sizing to a specific archive. The 34 series runs 5, 9, 15, 20 and 25 cu ft. The 40 series adds 9.4, 12 and 21 cu ft, with a low-profile 12 cu ft version for benches with overhead constraints. Deeper still: 1.7 cu ft at -43°C, 3.1 cu ft at -45°C and 6.8 cu ft at -45°C.
So-Low's CH40 range covers the same band at 3.5, 9, 15, 20 and 25 cu ft. Accucold's EL series reaches -45°C in 8.4, 11, 13 and 15 cu ft. Arctiko's biomedical range includes the SF-150 and SF-500.
Ultra-Low Chest Freezers to -86°C
Chest ULT freezers hold -86°C with better temperature stability during lid openings than an upright ULT, which is why long-term archives frequently use chest format even though access is slower.
So-Low offers three ULT chest families. The C40 range runs 2 cu ft mini, 5, 9, 14, 17, 21 and 27 cu ft. The NC40 range parallels it, including the 22 cu ft and 27 cu ft. The VSC40 family adds variable speed compressor operation, from the 2 cu ft mini up to 27 cu ft.
Follett's ULT chest options are the FZRC3 VIP ECO at 3.0 cu ft and the FZRC25 at 25.3 cu ft.
A note on mini ULT chest freezers: a 2 or 3 cu ft unit sounds like a small purchase but it is a serious instrument with a serious price, because reaching -86°C requires cascade refrigeration regardless of cabinet size. They exist for satellite storage and for labs archiving small volumes of very high-value material, not as a budget entry point.
Commercial and Food Service Chest Freezers
This collection also carries NSF-rated commercial chest freezers for food service, which are a different product from laboratory units despite the similar shape. They are built for food storage and hold standard freezing temperatures, without the temperature uniformity, alarms or documentation features a laboratory unit provides.
Summit's Focus and Nova ranges are NSF-7 approved: Focus106 at 9.5 cu ft, Focus131 at 12.4, Focus151 at 14.8, Focus171 at 17 and the flat-top Nova22 with digital controls. For larger volumes, the SCFM252 at 92 inches wide.
Koolmore's commercial range spans 7, 15.9, 24 and 30 cu ft two-door. The Whynter CDF-177SB countertop glass door display freezer at 1.8 cu ft is a merchandising unit rather than storage.
Do not substitute a commercial food service freezer for laboratory or clinical storage. They are not built to the same temperature uniformity, have no alarm infrastructure, and will not support the documentation a regulated setting requires.
Frequently Asked Questions
Why do chest freezers hold temperature better than uprights?
Cold air is denser than warm air. When an upright freezer door opens, cold air pours out of the bottom and room air flows in at the top, so the cabinet loses most of its cold air on every opening. When a chest freezer lid opens, the cold air stays in the box because there is nowhere lower for it to go. That same effect extends how long a chest freezer holds usable temperature during a power failure, particularly when it is well filled.
Should I choose a chest or an upright freezer?
Chest for archives and long-term storage where the contents are accessed rarely, because temperature stability is better and the running cost lower. Upright for daily working stock, because finding one box at the bottom of a full chest freezer means lifting out everything above it, and doing that repeatedly wastes time and defeats the temperature advantage. Many labs run both, using a chest for the archive and an upright for the working set.
What temperature do I need: -25, -40 or -86°C?
Match the temperature to what your protocols specify for the material and the intended storage duration. Standard -25°C covers general laboratory and clinical frozen storage. Low temperature -34 to -45°C suits longer-term sample storage and certain reagents. Ultra-low -86°C is for cell lines, enzymes, nucleic acids and long-term biospecimen archives. Storing at a higher temperature than the protocol specifies compromises the material over time in ways that may not be visible until the sample fails.
How do I read So-Low chest freezer model numbers?
The prefix indicates the temperature family and the number after the dash is capacity in cubic feet. CH25 is a -25°C chest freezer, CH40 is -40°C, and the C40, NC40 and VSC40 families are ultra-low chest units, with VSC indicating a variable speed compressor. So CH40-15 is a 15 cu ft chest freezer at -40°C. ScienTemp uses a similar logic, with the first number being the target temperature.
How long does a chest freezer hold temperature in a power outage?
Longer than an upright of the same rating, and considerably longer when full, since frozen mass acts as thermal ballast. How long specifically depends on the unit, its insulation, ambient temperature and how full it is, so treat any general figure with caution and do not build a contingency plan around an assumption. If the contents are irreplaceable, the plan needs backup power, an alarm that reaches someone out of hours, and a written procedure for relocating contents. See our ULT backup planning guide.
Can I use a commercial chest freezer for laboratory samples?
No, not for anything regulated or valuable. Commercial food service chest freezers are built for food storage. They do not deliver the temperature uniformity a laboratory unit provides, have no alarm infrastructure, and cannot support the temperature documentation a regulated setting requires. The similar appearance is misleading; the engineering behind it is not comparable.
What does NSF-7 approved mean on a commercial chest freezer?
NSF/ANSI 7 is a standard covering commercial food service refrigeration equipment, addressing construction, cleanability and food temperature performance. It is a food service standard, so it tells you the unit is suitable for a commercial kitchen. It is not a laboratory or medical storage standard and should not be read as one.
Why is a small ULT chest freezer so expensive?
Reaching -86°C requires cascade refrigeration, meaning two refrigeration circuits working in series, and the cost of that system does not scale down proportionally with cabinet size. A 2 cu ft ULT chest freezer contains essentially the same refrigeration technology as a large one. Mini ULT units exist for satellite storage and small volumes of very high-value material, not as an economical entry point into ultra-low storage.
What is a variable speed compressor on a ULT freezer?
A variable speed compressor modulates output rather than cycling on and off, which holds temperature in a narrower band, recovers faster after lid openings, and generally uses less energy and runs quieter. On a ULT freezer that runs continuously for years, the energy difference is a meaningful part of total cost of ownership. So-Low's VSC40 family uses this approach.
Where should a chest freezer be installed?
Somewhere with adequate ventilation clearance around the condenser, an ambient temperature within the unit's rated range, and enough overhead room for the lid to open fully, which is easy to overlook under a bench or shelf. ULT freezers in particular reject significant heat into the room and can raise ambient temperature noticeably in a small space, which then degrades their own performance. Check the delivery route too, since larger chest freezers are heavy and arrive by freight.
MediDepot Purchasing Advantages
- Price Match Guarantee: found the same model number for less elsewhere? We will match the verified price.
- Equipment Financing: ULT freezers are a significant capital item, financing spreads the cost.
- Extended Warranty: coverage on compressors running continuously, which is where these units fail first.
- Military Discount: available for qualifying military medical and research facilities.
- Request a Quote: temperature tier and capacity sizing, backup planning questions and freight scheduling.
Related Buying Guides
- ULT Freezer vs Lab Freezer: Cost of Ownership & Backup Planning
- Laboratory Freezer Size Comparison Guide
- Choosing the Right Medical Freezer
- Complete Guide to Long-Lasting ULT Freezers
- Medical Refrigerator Temperature Monitoring Guide
- Lab Equipment Supplier Guide
