Pro tip
Positive vs negative cold in catering: which equipment for what?
Published on 15/04/20261 min read
Refrigeration at 0/+8 °C or freezing at -18/-22 °C: uses, equipment and best practices to never break the cold chain.
Positive cold (temperature between 0 and +8 °C) covers most kitchen needs: storing raw meat, fish, vegetables, dairy, prepared meals and drinks. Positive cabinets should be favoured for daytime storage, and refrigerated prep tables for mise en place. The trade rule sets +4 °C maximum for the most sensitive products (poultry, fresh cheese, broken eggs).
Negative cold (temperature between -18 and -22 °C) is for freezing and long-term storage. Upright freezers and chest freezers suit storage, while blast chillers (-30 °C in minutes) quickly drop core temperature of prepared meals to preserve quality and food safety.
The blast chiller is the most structuring investment for a kitchen that plans ahead. It lets you cook in advance, reach +3 °C at the core in under 2 hours (HACCP standard) and store in positive cold for up to 5 days. Reckon €2,500 to €8,000 excl. VAT depending on capacity (10 to 40 kg per cycle).
Respecting the cold chain means three simple rules: never refreeze a thawed product, check temperature on receipt (reject if above standard) and trace the temperature of each appliance with a data-logger or manual reading twice a day. A traceability log is the centrepiece of veterinary inspections.
Frequently asked questions
Maximum temperature for poultry in a cold room?
+4 °C maximum (HACCP standard applicable to HORECA). Beyond +4 °C for more than 2 hours, poultry must be consumed immediately or destroyed. A fast drop in a blast chiller to +3 °C after cooking is mandatory for deferred storage.
Can a refrigerated cabinet act as a freezer?
No — positive (0/+8 °C) and negative (-18/-22 °C) cabinets use different compressors and insulation. A positive cabinet will never drop below -2 °C even at maximum setting.
How long can a product stay in negative cold?
By category: 2 to 3 months for fatty fish, 6 months for beef, 8 to 12 months for blanched vegetables, up to 18 months for bread. Beyond that, organoleptic quality degrades even if safety is maintained.