Refrigerated Shipping Containers: Uses and Buying Tips

Learn how refrigerated shipping containers work, their common uses and what to check before purchasing a reefer for temperature-controlled storage.
Refrigerated Shipping Containers: Uses and Buying Tips
A refrigerated shipping container, commonly called a reefer container, is designed to maintain controlled temperatures during transportation or stationary storage. It combines an insulated steel body with an integrated refrigeration system.
Reefers are useful when standard dry containers cannot provide the temperature control required by food, beverages, agricultural products and other sensitive goods.
Browse Cargo Vault’s available Refrigerated Shipping Containers to compare sizes and conditions for your project.
What Is a Refrigerated Shipping Container?
A refrigerated shipping container is an insulated container fitted with temperature-control equipment.
Unlike a standard dry container, a reefer is designed to circulate conditioned air around compatible cargo while reducing heat transfer through its walls, roof, doors and flooring.
Reefers are commonly available in 20ft and 40ft configurations, including High Cube models. Exact internal dimensions vary because insulation and refrigeration equipment occupy some of the space available inside a standard container.
Before purchasing, confirm the measurements, operating specifications and capacity of the individual unit.
How Does a Reefer Container Work?
The refrigeration system circulates conditioned air through the container to help maintain the selected temperature.
Many reefer containers use specialized flooring channels to distribute air beneath the cargo. The air then travels around the stored goods and returns to the refrigeration unit.
For this system to work correctly:
- The reefer must have a suitable electrical supply
- Airflow channels must remain unobstructed
- Cargo must be arranged correctly
- Doors and seals must be in good condition
- The temperature setting must suit the products
- The refrigeration machinery must be operating properly
A reefer is primarily designed to maintain a controlled temperature. It should not automatically be assumed to rapidly cool warm products unless the model and application have been assessed for that purpose.
Some products may need to be pre-cooled before loading.
Refrigerated Container vs. Standard Dry Container
The correct choice depends on whether active temperature control is required.
| FeatureRefrigerated ContainerStandard Dry Container | ||
| Insulated interior | Yes | Generally no |
| Integrated refrigeration system | Yes | No |
| Requires power for cooling | Yes | No |
| Internal capacity | Reduced by insulation and equipment | More general cargo space |
| Best suited for | Temperature-sensitive goods | General dry storage |
| Maintenance requirements | Refrigeration and electrical servicing | Mainly structural maintenance |
If your goods do not require active cooling, a standard 20ft Shipping Container or 40ft Shipping Container may provide a simpler and more economical storage option.
Common Uses for Reefer Containers
Refrigerated shipping containers may be used for:
- Food and beverage storage
- Agricultural products
- Flowers and temperature-sensitive plants
- Restaurant inventory
- Catering supplies
- Event overflow storage
- Temporary cold-storage projects
- Seafood and meat products
- Dairy products
- Selected pharmaceutical or medical products
- Research materials
- Industrial products requiring controlled temperatures
Food, pharmaceutical and medical products may be subject to strict temperature, sanitation, monitoring and licensing requirements.
Confirm that the selected unit, site and operating procedures meet all applicable industry and regulatory requirements before storing sensitive goods.
Operating vs. Non-Operating Reefer Containers
One of the most important decisions is whether you need an operating or non-operating reefer.
Operating Reefer
An operating reefer has a refrigeration system intended to provide active temperature control.
Before purchasing one, ask whether:
- The refrigeration unit has been tested
- It reaches and maintains the required temperature
- The controls operate correctly
- Maintenance records are available
- Any alarms or fault codes are present
- The electrical components have been inspected
- Repairs or replacement parts may be required
A basic power-on demonstration may not reveal every problem. Where possible, have the system assessed by a qualified refrigeration professional.
Non-Operating Reefer
A non-operating reefer may still provide an insulated enclosure, but its original refrigeration system may be damaged, disconnected, incomplete or no longer economical to repair.
Non-operating reefers may be considered for:
- Insulated dry storage
- Workshops
- Specialized conversions
- Projects using a separate cooling system
- Storage that does not require active temperature control
A non-operating reefer should not be purchased when reliable cooling is required unless a qualified professional has inspected the unit and confirmed an appropriate repair or replacement plan.
Choosing the Right Reefer Size
20ft Reefer Container
A 20ft reefer may be suitable for:
- Restaurants
- Caterers
- Farms
- Small food businesses
- Events
- Compact cold-storage projects
- Sites with limited placement space
Its smaller footprint can be useful when available space or delivery access is restricted.
40ft Reefer Container
A 40ft reefer provides more storage capacity and may suit:
- Food distributors
- Large restaurants
- Agricultural businesses
- Warehouses
- Industrial facilities
- Large events
- High-volume temporary cold storage
A 40ft unit requires more space for delivery, placement and loading. It may also require a larger electrical and operating budget.
Review the shipping container dimensions and capacity guide when comparing sizes.
What Should You Check Before Buying?
Required Temperature
Determine the exact temperature range and level of control required by your products.
Not every refrigeration unit is suitable for every application. Ask whether the unit can maintain your required setpoint under the expected weather, loading and operating conditions.
Electrical Requirements
A functioning reefer must normally be connected to a suitable electrical supply while operating.
Confirm:
- Required voltage
- Power phase
- Plug and connection type
- Electrical capacity
- Cable requirements
- Disconnect and protection requirements
- Expected energy consumption
- Generator compatibility, if relevant
Have the site’s electrical supply assessed and installed by a qualified professional. Include electrical preparation and ongoing energy costs in your budget.
Refrigeration Equipment
Inspect or test the refrigeration machinery when possible.
Ask about:
- Current operating condition
- Temperature controls
- Fault codes
- Compressor performance
- Fans
- Electrical components
- Refrigerant system
- Defrost operation
- Recent servicing
- Available maintenance history
- Availability of replacement parts
A reefer with an attractive exterior may still require expensive mechanical or electrical work.
Interior Condition
Inspect the insulated walls, ceiling, floor and interior fittings.
Look for:
- Damaged insulation
- Punctures
- Dents
- Corrosion
- Strong or persistent odors
- Contamination
- Damaged flooring
- Blocked airflow channels
- Areas that may be difficult to sanitize
The previous cargo may matter when the container will be used for food or another sensitive application.
Doors and Seals
Door seals help prevent unwanted air exchange.
Check for:
- Torn or hardened seals
- Gaps around the doors
- Misaligned hinges
- Damaged locking bars
- Doors that are difficult to close
- Condensation or water entry
- Air leakage
Damaged seals can reduce efficiency and make temperature control more difficult.
Airflow System
Correct airflow is essential for temperature consistency.
Do not pack goods tightly against the walls, ceiling or refrigeration unit. Avoid blocking the flooring channels or return-air path.
Follow the unit manufacturer’s loading guidance and the requirements of the products being stored.
Drains and Moisture
Inspect drainage points and check for standing water, blockages or corrosion.
Moisture problems can contribute to odors, contamination, mold or structural deterioration. Cleaning and drainage procedures should be included in the operating plan.
Controls and Monitoring
Confirm how the reefer’s temperature is set, displayed and monitored.
Depending on the application, you may need:
- Independent temperature sensors
- Data logging
- Remote alerts
- High- and low-temperature alarms
- Door-opening records
- Calibration checks
- Written inspection records
Independent monitoring can provide additional protection when storing valuable or highly sensitive goods.
Plan the Interior Layout
The interior should be arranged so conditioned air can circulate properly.
When planning the layout:
- Leave required space around the refrigeration unit
- Keep airflow channels clear
- Avoid overloading the container
- Use suitable pallets or shelving
- Maintain safe walking access where needed
- Separate incompatible products
- Follow safe stacking limits
- Keep goods away from damaged or contaminated surfaces
Placing too much cargo inside the unit can create warm areas and uneven temperatures.
Prepare the Site and Delivery Area
A reefer container should be placed on firm, level ground with sufficient clearance for delivery, ventilation and maintenance.
Check the site for:
- Narrow gates
- Overhead power lines
- Trees and low branches
- Buildings and fences
- Soft or unstable ground
- Poor drainage
- Insufficient truck access
- Limited service access
- Unsafe electrical routing
The refrigeration end must remain accessible for inspection and servicing. Avoid positioning it too close to a wall, fence or other obstruction.
Review Cargo Vault’s delivery information before preparing the site.
Plan for Maintenance and Power Interruptions
Refrigeration equipment requires regular inspection and servicing.
A maintenance plan may include:
- Cleaning the interior
- Checking door seals
- Inspecting drains
- Testing controls and alarms
- Cleaning heat-exchange components
- Monitoring fans
- Checking electrical connections
- Reviewing fault codes
- Inspecting cables and plugs
- Scheduling professional servicing
Temperature-sensitive goods may also require a backup plan for power interruptions or equipment failure.
Depending on the products and site, this could involve:
- A suitable backup generator
- Independent temperature monitoring
- Automatic alerts
- An emergency repair contact
- Alternative cold-storage space
- A documented product-transfer plan
The backup plan should be tested before valuable or regulated goods are stored.
Questions to Ask Before Ordering a Reefer
Before purchasing a refrigerated shipping container, answer these questions:
- What products will be stored?
- What temperature range is required?
- Is active cooling necessary?
- Is a 20ft or 40ft unit more suitable?
- Has the refrigeration system been tested?
- Are maintenance records available?
- Can the site supply the required electrical power?
- What are the estimated operating costs?
- Is independent temperature monitoring required?
- Does the interior meet the necessary sanitation standards?
- Is there sufficient delivery and service access?
- What is the backup plan for a power or equipment failure?
- Are permits, licenses or inspections required?
- Will the unit be used for storage, transportation or both?
Providing these details to your supplier can help identify a suitable unit and reduce unexpected installation or operating problems.
Request a Refrigerated Container Quote
The right refrigerated container depends on the products being stored, required temperature, size, electrical supply, operating condition and delivery location.
Cargo Vault Containers can help you compare available reefer-container sizes and conditions.
Request a refrigerated container quote and provide your location, preferred size, intended use, required temperature and available electrical supply.
