A reefer container is a specialised shipping container designed to keep goods at a controlled cool temperature. Using a combination of insulation and powered cooling, these containers function like large refrigerators, maintaining temperatures between -25°C and +30°C. Think of it like a huge chilly-bin.
They are essential for transporting temperature-sensitive products, from fresh produce and dairy to pharmaceutical supplies. Reefer containers also play a crucial role in disaster relief and remote storage solutions.
In this guide, we’ll cover how refrigerated containers work, what they can store, and the sizes available. Plus, we’ll break down the costs of reefer containers and what to consider when choosing one for your needs.
Image Source: TenFour Magazine
Image Source: Shipping Wonders of The World
Modern reefer containers are much more flexible in terms of size, capabilities and ease of transport. While their power sources have evolved from propane to diesel and electric, their cooling motors remain positioned at one end, ensuring consistent internal temperatures for perishable cargo.
Reefer containers use an integrated cooling system to regulate internal temperatures. The cooling unit is located at one end of the container and circulates cold air throughout the insulated interior, maintaining a consistent temperature.
These containers can be powered by an external power source on land, a generator on ships, or even portable diesel-powered units.
Advanced technology allows precise temperature control, humidity regulation, and proper airflow, making reefers ideal for transporting sensitive cargo.
Electric Reefer motor
Reefer doors open showing emergency exit, curtains and steel floor
Proper ventilation is essential for maintaining a reefer’s temperature and keeping goods fresh. To allow for proper airflow, cargo should be packed in ventilated boxes, and there should be no large gaps between products and the reefer’s walls.
Along with the refrigeration unit, which sits at one end of the container, reefers are built with insulation between the internal and external walls. The quality and thickness of this insulation play a key role in cooling efficiency. High-performance insulation reduces the workload on the refrigeration unit, cutting down energy costs and improving long-term performance—especially in New Zealand’s variable climate, from hot summers to cooler winters.
Electric reefer units are most commonly used for static storage at warehouses, events, or other sites with access to power. They are also used for transporting goods, but while in transit the cooling motor remains inactive.
During this time, the reefer relies on its insulation to maintain a stable internal temperature, ensuring products stay within their required range until they reach their next powered location.
Diesel reefers are commonly used for transport, especially in New Zealand, where goods are moved long distances by truck, rail, and ferry. These containers are powered by a diesel generator set (genset), which supplies electricity to the refrigeration unit.
If delays occur, the genset can be easily refueled at transport depots, truck stops, or logistics hubs, ensuring the cargo remains at the correct temperature throughout its journey.
Reefer containers are designed to store a wide range of temperature-sensitive products, making them essential for industries like food distribution, pharmaceuticals, and floriculture.
Types of Goods Stored in Reefers:
Reefer containers can hold anything typically found in a supermarket’s fresh produce, chilled, or frozen sections. This includes:
To ensure efficient storage and transport, most reefer containers are designed to fit two pallets side by side, allowing for secure and organised loading.
For businesses needing higher storage capacity, some reefers come with Vertical Load Bars, allowing double stacking of pallets. This feature effectively doubles the internal storage space while maintaining airflow and preventing damage to goods.
The cost to hire or buy a reefer container depends on several factors, including the size, specifications, and key features of the unit.
When hiring a reefer, there is a minimum hire period of 31 days, along with transport charges. For rentals longer than one month, invoices will be sent on a monthly basis.
For an accurate quote figure, fill out our quick and easy Get a Quote form and one of our friendly Customer Service Team members will give you a call.
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