Chambre froide positive ou négative : laquelle choisir ?

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Positive or negative cold room: which one to choose?

Published on 15/04/20262 min read

Positive or negative cold, temperature, volume, insulation: everything to choose the right cold room for a professional kitchen.

The first decision is positive versus negative cold. A positive cold room holds 0 to +8 °C: chilled storage for fruit and vegetables, dairy, fresh meat, drinks and same-day prepared dishes. A negative cold room runs from -18 to -22 °C for freezing and long-term storage of frozen goods, meats and make-ahead preparations.

In practice most kitchens need both. A 60 to 120-cover restaurant typically fits a positive cold room for daily fresh rotation and a more compact negative one for frozen goods and stored preparations. Positive accounts for the largest volume, negative for backup.

Sizing depends on the volume of goods stored and delivery frequency. Plan roughly 1 m³ usable per 40 to 60 covers in positive cold. Keep a margin: an undersized room forces daily deliveries and raises logistics cost, while oversizing needlessly increases power consumption.

Insulation and the cooling unit drive long-term performance. A negative cold room needs thicker insulating panels (100 to 120 mm vs 60 to 80 mm for positive) and an insulated floor to prevent freezing of the base. Check unit power against volume, the climate class suited to kitchen ambient temperature, and automatic defrost on negative models.

For HACCP compliance, a professional cold room must allow visible temperature control, keep the cold chain unbroken and be easy to clean (rounded corners, non-slip floor, sealed lighting). Also consider access: a wide door eases trolley passage and limits cold loss on opening.

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Frequently asked questions

What is the difference between positive and negative cold?

Positive cold (0 to +8 °C) preserves fresh goods: vegetables, dairy, fresh meat, drinks. Negative cold (-18 to -22 °C) freezes and stores frozen goods long term. Most pro kitchens use both: a positive room for daily rotation, a negative one for frozen reserves.

What cold room size for a restaurant?

Plan about 1 m³ usable in positive cold per 40 to 60 covers, with a margin based on delivery frequency. An 80-cover restaurant delivered twice a week needs 2 to 3 m³ positive plus a compact negative room for frozen goods.

Does a negative cold room use a lot of energy?

Negative cold uses more than positive due to the larger temperature gap. Good insulation (100-120 mm panels, insulated floor), a correctly sized unit and automatic defrost limit overconsumption. Oversizing the room needlessly raises the bill.

Positive or negative cold room: which one to choose?

Frequently asked questions

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