Every time a vaccine arrives at a clinic at the right temperature, or a bag of prawns reaches a Melbourne restaurant still frozen, a transport refrigeration system did the work. Most people never think about it. Business owners who move perishable goods cannot afford not to.
Transport refrigeration is the mechanical cooling system fitted to a vehicle van, truck, trailer, or ute to keep cargo within a controlled temperature range during transit. It is separate from the vehicle’s air conditioning and runs independently, maintaining cargo temperatures anywhere from +25°C down to -25°C depending on the unit and the load.
How It Actually Works
A transport refrigeration unit (TRU) operates on the same refrigeration cycle as a household fridge: a refrigerant gas is compressed, releases heat, expands, absorbs heat from inside the cargo space, and repeats. The difference is that a TRU must do this reliably while the vehicle is moving, stopping and starting in traffic, parked with the engine off, and loading product through open doors on a 38°C summer day in Melbourne.
The compressor is the part that does the heavy work. In most van and small truck setups, the compressor is driven directly by the vehicle engine (called a direct-drive unit). Larger truck and trailer units often carry their own diesel engine to run independently of the vehicle.
Why Temperature Precision Matters
Food Standards Australia New Zealand (FSANZ), under Standard 3.2.2 of the Food Standards Code, requires that potentially hazardous chilled food be stored and transported at 5°C or below. Frozen food must be kept at -15°C or below. These are legal requirements, not suggestions.
The consequences of getting it wrong are real. The 2018 listeria outbreak linked to cold smoked salmon in Australia, investigated by NSW Food Authority, was traced in part to inadequate cold chain management. A single temperature breach during transport can render a full load unsaleable and, in pharmaceutical or medical contexts, dangerous.
Beyond compliance, consistent refrigeration protects business. The Australian Food and Grocery Council estimates that cold chain failures cost the Australian food industry over $1 billion annually in product losses and liability.
Who Uses Transport Refrigeration in Australia
The most common users are:
- Food and beverage distributors (fresh produce, dairy, meat, seafood)
- Pharmaceutical and medical supply companies (vaccines, biologics, insulin)
- Florists and horticulture businesses
- Catering and hospitality suppliers
- Ice cream and frozen goods retailers
The industries are different, but the requirement is the same: the product must arrive at the correct temperature, documented, and undamaged.
Where Auto Frigo Fits
Auto Frigo, with two service locations in Somerton and Dandenong South, installs, services, and repairs transport refrigeration systems across Melbourne and within 200km for emergency call-outs. The focus is purely on transport refrigeration, which means the technicians know the specific failure modes, installation requirements, and compliance considerations for vehicles rather than cold rooms or supermarket cabinets.
For a business buying its first refrigerated van or managing a growing fleet, that specialisation matters. A generalist refrigeration technician familiar with building systems may not be the right person diagnosing a fault on a moving vehicle.
FAQs
Does a transport refrigeration unit run when the van engine is off?
It depends on the unit type. Direct-drive units stop when the engine stops. Standby units plug into 240V power at a depot to keep running overnight. Self-powered units have their own small engine and run independently. If your cargo needs to stay cold during overnight loading, you need a standby or self-powered unit.
What temperature does a refrigerated van hold?
Most van refrigeration units can hold between -25°C and +12°C. The exact setpoint depends on your cargo. Fresh produce typically needs 2°C to 4°C. Frozen product needs -18°C or below. Your installer should commission the unit to your specific requirements, not leave it on a default setting.
How long does installing a transport refrigeration unit take?
For a standard van with a pre-built unit, 1 to 2 days. Custom multi-temperature van conversions can take 5 to 10 days depending on the insulation lining and electrical requirements. Auto Frigo recommends booking at least 2 weeks ahead to avoid delays, particularly during the pre-summer period from September to November when demand in Melbourne spikes.
Is transport refrigeration the same as a car air conditioner?
No. A vehicle air conditioner cools the cabin for the driver. A transport refrigeration unit cools the sealed cargo area. They are separate systems, often running at the same time, drawing on different power sources.
Can any mechanic service a transport refrigeration unit?
Legally, refrigerant handling in Australia requires an ARCtick licence under the Australian Refrigeration Council. A general mechanic without this licence cannot legally handle the refrigerant. Transport refrigeration also has vehicle-specific installation requirements that differ from stationary systems.
