A container cold room is a 20ft or 40ft steel container lined with insulation and fitted with a refrigeration unit, delivered ready to connect to power. A prefabricated panel cold room is assembled on site from PU sandwich panels and can be built to almost any size or layout. Choose a container when you need mobility, fast deployment or a remote site without a building; choose panels when you need more than about 60 m³, several temperature zones, or a permanent installation inside a building.
What is a container cold room?
A container cold room uses a standard ISO container shell—new or reconditioned—with PU insulation on walls, roof and floor, a reinforced floor, an insulated door, lighting and a refrigeration system. The refrigeration is usually either a monoblock unit mounted through the front wall or end, or a split system with an outdoor condensing unit and an internal evaporator. Because the box is a shipping container, it can be lifted by crane, moved by truck and placed on a simple level base.
Typical internal dimensions after insulation are approximately:
| Container | Approximate internal size | Approximate volume | Typical use |
|---|---|---|---|
| 20ft standard | About 5.4 × 2.2 × 2.1–2.2 m | About 25–28 m³ | Shops, farms, small fish landings, event catering |
| 40ft high-cube | About 11.5 × 2.2 × 2.3–2.4 m | About 55–65 m³ | Distribution hubs, mining and construction camps, agricultural collection |
Thicker insulation for freezer duty reduces internal dimensions, so confirm the final internal size for your chosen temperature.
What is a prefabricated panel cold room?
A panel cold room is assembled from insulated sandwich panels, usually 75–150 mm thick, with camlock joints that lock panels together. Panels are cut to the room's dimensions in the factory, flat-packed for shipping, and assembled by a small crew on site. The same system scales from a 6 m³ restaurant walk-in to warehouse-scale stores, and it can be divided into chiller, freezer and anteroom chambers.
How do container and panel cold rooms compare?
| Factor | Container cold room | Panel cold room |
|---|---|---|
| Size | Fixed: 20ft or 40ft footprint | Any size; easy to subdivide |
| Mobility | High; can be relocated by truck and crane | Can be dismantled and rebuilt, but not moved as a unit |
| Site work | Level base and power connection | Floor preparation, panel assembly, piping and wiring |
| Time to operate on site | Typically hours to a day after delivery | Typically days to weeks, depending on size |
| Building needed | No; weatherproof outdoor unit | Usually indoors or under a roof; outdoor rooms need a roof and weather protection |
| Cost per m³ | Higher, especially for freezers | Generally lower, falling further as size increases |
| Shipping | Ships as its own container | Panels ship flat-packed, often with equipment for several rooms in one container |
| Expansion | Add another container | Add panels or chambers |
| Security | Steel shell, lockable | Depends on surrounding building |
When does a container cold room make more sense?
- Remote or temporary sites such as mining camps, construction projects, refugee and relief operations, field hospitals and events.
- No suitable building or no time to build one before the season starts.
- Seasonal operations, such as harvest collection points that move between regions.
- Leasing and rental businesses that move units between customers.
- Security-sensitive storage where a lockable steel shell is valuable.
When is a panel cold room the better choice?
- Capacity above about 60 m³, where several containers become more expensive and harder to manage than one room.
- Multiple temperatures, such as a chiller and freezer side by side with a shared anteroom.
- Integration with a building, such as a supermarket back-of-house, restaurant kitchen or processing hall.
- Forklift and pallet racking, which need ceiling height and door widths beyond what containers allow.
- Blast freezing at scale, which needs space for airflow around trolleys and large evaporators.
Which refrigeration system suits a container cold room?
Monoblock unit
A monoblock combines compressor, condenser, evaporator and controls in one housing that mounts through a wall opening. It is pre-charged and tested in the factory, so there is no site piping. Monoblocks suit 20ft containers and smaller 40ft applications where quick installation matters most.
Split system
A split system uses an outdoor condensing unit and an internal air cooler, connected by refrigerant piping. It offers more capacity, quieter interior operation and easier selection for freezers or hot climates. For a container, the condensing unit is often mounted on the container end frame so the whole package moves together.
What should you check before ordering a container cold room?
- Room temperature and product: chiller at 0 to +5 °C or freezer at −18 to −25 °C.
- Design ambient: hot desert and tropical sites need condensers and compressors selected for 43–46 °C.
- Power supply: 220 V single-phase or 380/440 V three-phase, 50 or 60 Hz; check whether a generator will be used and size it for compressor starting current.
- Door position and size, interior shelving, floor finish (aluminum T-floor, stainless or anti-slip steel) and lighting.
- Insulation thickness: typically about 100 mm for chillers and 120–150 mm for freezers.
- Monitoring: temperature recorder or remote alarm for unattended sites.
- Foundation: level concrete pads or compacted gravel with corner supports to keep the doors aligned.
How do running costs compare?
For the same internal volume and temperature, running cost depends mainly on insulation thickness, door traffic and the efficiency of the refrigeration unit, not on whether the room is a container or panel construction. Two factors usually favor panel rooms in permanent installations:
- Location: panel rooms are often built inside a building, out of direct sun, which lowers transmission load and keeps the condenser in a cooler environment.
- Surface-to-volume ratio: one large panel room has less wall area per cubic meter than several containers holding the same volume.
Containers standing outdoors in hot sun benefit greatly from a simple shade roof above them. A ventilated sunshade can reduce roof surface temperature by many degrees and lowers both the refrigeration load and the condenser's operating temperature.
How are they shipped and installed?
A container cold room ships as its own container: it is loaded at the factory with its refrigeration system already installed and tested, then delivered by sea and truck to site. On arrival, it is lifted onto its base, leveled, connected to power and started. A split system may need its condensing unit fitted to the container frame and a short pipe connection, depending on the design.
A panel cold room ships flat-packed. Panels, doors, condensing units, evaporators, piping and accessories are crated and loaded together, so equipment for one large room or several smaller rooms can often travel in a single container. Installation requires a crew familiar with camlock assembly, refrigeration piping, evacuation and charging. Installation drawings and video guidance help local contractors complete the work correctly.
Is a converted reefer container the same thing?
Not exactly. A refrigerated shipping container ("reefer") is built for transport, with an integrated machine designed for ship and terminal power. A purpose-built container cold room is designed for static use, usually with thicker insulation, a personnel door, and a refrigeration system chosen for local power and service availability. Purpose-built units are generally easier to maintain locally because they use standard cold room components rather than proprietary reefer machinery.
Can you combine container and panel cold rooms?
Yes. A distributor might build a permanent panel cold store at its main warehouse and place 20ft or 40ft container cold rooms at satellite depots, collection points or temporary sites. Using the same refrigerant, controller type and spare parts across both reduces training needs and the stock of spares that must be kept on hand. The same logic applies to fleets of container units: standardizing on one or two refrigeration models makes field service much simpler.
How do you decide?
Start with three questions: how much volume do you need, will the room ever move, and is there a building to put it in? If the answer is under about 60 m³, possibly moving, and no building, a container is usually the practical choice. If you need more volume, several temperatures, or a permanent installation, a panel room is usually more economical. See our 40ft container cold room blueprint or contact us with your site conditions for a recommendation.
Frequently asked questions
How much does a 40ft container cold room hold?
A 40ft high-cube container cold room typically has about 55–65 m³ of internal volume, depending on insulation thickness. Usable storage depends on shelving, pallets and air circulation space.
Can a container cold room work as a freezer?
Yes. With about 120–150 mm insulation and a low-temperature refrigeration system, a container cold room can hold −18 to −25 °C. Confirm the unit is selected for your ambient temperature.
Does a container cold room need a foundation?
It needs a level, firm base such as concrete pads or compacted gravel under the corner castings. An uneven base can twist the frame and stop the door sealing properly.
Can a container cold room run on a generator?
Yes, if the generator is sized for the compressor's starting current as well as running power. Soft starters or inverter compressors reduce the required generator size.
