Commercial refrigeration
What temperature should a cool room be?
Most commercial cool rooms run somewhere between 0 and 4 degrees. What matters is the temperature of the food, which the Food Standards Code wants at 5 degrees or below. A room can look fine on the display while the food in the back corner sits warmer than that.
5 min read
The short answer
Why 5 degrees is the number everything hangs off
The Food Standards Code requires businesses to keep potentially hazardous food at 5 degrees or colder. Hot food has to stay at 60 or hotter. Food Standards Australia New Zealand sets out both limits in its guide to keeping food at the right temperature. Bacteria multiply fastest in the band between those two numbers, which is why people call it the danger zone.
So you set a cool room below 5, usually between 0 and 4. A working venue never lets a room sit still. The door opens every few minutes through service and warm deliveries go in, so the room spends the night pulling itself back down. Set it at exactly 5 and every door opening pushes the food over the line.
Meat, seafood and fresh produce each want their own range, which is why a venue with real volume often runs more than one room.
Working temperatures by application
These are the ranges we set rooms to and service them against. Your own food safety program has the final say for your venue. For anything specific to what you handle, check with the NSW Food Authority.
| Application | Working range | Notes |
|---|---|---|
| General cool room | 0 to 4 °C | Holds food at or below 5 °C through normal door traffic |
| Meat and seafood | 0 to 2 °C | Shelf life falls away quickly above this |
| Fruit and vegetables | 4 to 8 °C | Cold damages some produce as much as heat does |
| Freezer room | −18 °C or colder | Keeps product frozen hard through defrost cycles |
| Beer cellar | 2 to 4 °C | Set for the pour rather than for food safety |
These are working setpoints for the room. Your food safety program still decides which temperature records you keep.
The display on the wall is not the temperature of your food
The controller reads the air where its sensor sits, usually near the evaporator, where the air is coldest and moves the most. Food in a back corner, packed tight on a pallet or pushed against a wall can sit several degrees warmer than the number on the display.
That gap lets a room look fine all week and still fail a probe check. The fix is often nothing to do with the refrigeration. Stock stacked to the ceiling, boxes blocking the evaporator or a room loaded past its design load all create warm spots that turning the setpoint down will never reach.
If you are chasing a temperature problem, probe the food in the worst corner of the room instead of trusting the wall. When the food comes back warm while the display looks fine, look at airflow and loading before the plant. For a new room, cool room installation covers how we size and build one to avoid that from the start.
If the room is running warm right now
A cool room rarely fails without warning. It drifts first. These checks find most of the reasons, two of which you can sort out yourself in ten minutes.
- 1
Probe the food, not the air
Check product temperature in the warmest part of the room. That tells you whether you have a food safety problem now or a refrigeration problem on the way.
- 2
Check the door
Does it swing shut and seal by itself? Can you see light through the seal anywhere? A failed seal is one of the most common causes and the cheapest to fix.
- 3
Check the evaporator
Heavy ice on the coil means the defrost is not doing its job and air has stopped moving through it.
- 4
Check the condenser
It usually sits outside or on the roof. If dust, grease or salt has furred up the fins, the system cannot get rid of heat and the room struggles on hot days first.
- 5
Think about what changed
A delivery stacked against the evaporator, a door propped open through a function or a heavier load than usual will all warm a room without anything breaking.
- 6
Call it in before it stops
A slow refrigerant leak or controls drifting out of calibration will not show up in any of these checks. Ring while the room is only drifting. Leave it until it stops and the same service call comes with a skip bin full of stock.
Coastal venues have a shorter maintenance interval than inland ones
Salt in the air corrodes condensers and outdoor fittings faster than inland air does. For venues along the Illawarra coast it decides how long a system lasts and how often it needs a service. A condenser that would run two years between cleans somewhere inland will want a look far sooner a few streets from the water.
Salt changes what we recommend at install too. A protective coil coating such as Blygold costs more up front and adds years to a condenser near the water. We recommend it for venues close to the beach. Whether it goes on comes down to the budget and how long the equipment needs to last.
For how that works day to day, see commercial refrigeration in Wollongong or refrigeration maintenance and breakdown cover. Freezer rooms have their own failure modes, mostly around defrost, which we cover under freezer room installation and repair.
Common questions
- What temperature should you set a commercial cool room to?
- Most cool rooms run between 0 and 4 degrees. The real target is the food, which has to stay at 5 degrees or colder under the Food Standards Code. Setting the room a few degrees under that gives you margin for a door that opens all through service.
- What temperature should a freezer room be?
- Minus 18 degrees or colder is the working standard. The Code only says frozen food has to stay frozen, but minus 18 is where the industry settles because it keeps product solid through door openings and defrost cycles over a full trading week.
- What is the food temperature danger zone?
- It is the band between 5 and 60 degrees, where bacteria multiply fastest. If food has sat in that band, the NSW Food Authority's 2-hour/4-hour rule decides what happens next. Under 2 hours it can go back in the cool room. Between 2 and 4 hours you use it straight away. Over 4 hours it goes in the bin.
- How often does a cool room need a service?
- Twice a year suits most venues, more often near the coast where salt corrodes and blocks condensers faster. A schedule catches blocked condensers, tired door seals and defrost drifting out of step while they are still cheap to fix.