What temperature should my commercial upright freezer be set to for safe frozen storage?

For Irish commercial kitchens, a practical target is -18°C or colder for frozen food storage.

Setpoint guidance:

Set the controller so the cabinet reliably holds -18°C even during busy periods. In many sites that means a setpoint around -18°C to -22°C, depending on door openings, load, and room temperature.

Remember the controller usually displays cabinet air temperature, which can swing during door openings and defrost. Your food safety decision should be based on a mix of logged air temps and periodic product checks (see below).

Verification tip (so you know it is truly holding):

Use a calibrated probe (or a check thermometer) and test between packs in the cabinet, not right at the door.

For higher confidence, do a weekly cross-check against a glycol bottle / simulated product or a known stable reference point and record the result in your HACCP logs.

Read the full guide: Unifrost Upright Freezer Temperature Controller Deep Dive Owner Hub.