Reefer
A refrigerated trailer used to haul temperature-controlled freight like food and pharmaceuticals.
Reefer in Practice
Temperature Logs Are Non-Negotiable
Reefer units continuously log temperature data, and receivers routinely pull those logs before accepting a load. A documented excursion outside the required range can lead to a rejected or discounted shipment, even if the freight looks fine visually.
Higher Pay, Higher Operating Cost
Reefer rates typically run above dry van on comparable lanes, but the trailer itself burns diesel to run the refrigeration unit independent of the tractor, adding a real fuel cost that has to be factored into whether a load is actually profitable.
Pre-Cooling Matters
Loading fresh product into a trailer that hasn't been pre-cooled to the required temperature can compromise the whole load before it even leaves the dock, so verifying the reefer unit reached set point before loading begins is a routine but critical step.
Reefer: What It Means and Why It Matters
Reefer freight pays a premium over dry van for a reason: temperature-controlled cargo is less forgiving of delay, mechanical failure, or careless handling, and the equipment itself costs more to buy, fuel, and maintain. Understanding how the reefer unit, temperature logs, and load type interact is essential before hauling anything that can spoil, since a single temperature excursion can mean a rejected load and a real financial loss.
How Reefer Freight Works
A reefer, short for refrigerated trailer, is built with insulated walls and a diesel or electric-powered refrigeration unit mounted at the nose of the trailer, allowing it to maintain a set temperature independent of the outside weather. Reefer units can hold freight cold, like frozen goods, or simply cool, like fresh produce and some pharmaceuticals, depending on what the shipment requires. Drivers set the temperature according to the bill of lading and monitor it throughout the run.
A Practical Example
A load of fresh produce might require the trailer held at 34°F, while a frozen goods load might require negative 10°F. Both are handled by the same reefer unit, just set differently, but a driver hauling mixed temperature freight in one trailer has to plan the load carefully since a single trailer can typically only maintain one zone effectively.
If the reefer unit fails mid-route and the temperature drifts outside the required range for an extended period, the receiver may reject the load entirely, and the carrier can be held liable for the value of the spoiled freight, which is part of why reefer cargo insurance and reefer breakdown coverage are worth carrying.
Why It Matters for Owner-Operators
Reefer freight generally pays more per mile than dry van, which is part of why many owner-operators eventually add a reefer to their operation. But that premium comes with added responsibility: fuel costs for the reefer unit itself, more frequent maintenance on the refrigeration system, and the financial exposure if a load spoils due to equipment failure or driver error. Weighing the added revenue against these added costs is essential before committing to reefer.
Common Misconceptions
A common misconception is that reefer freight is always more profitable than dry van once the higher rate is accounted for. After factoring in reefer fuel consumption and maintenance, the margin advantage can be smaller than it first appears. Another mistake is assuming any reefer trailer can handle any temperature-sensitive freight without checking specific requirements like humidity control or continuous run versus cycle-sentry settings.
Related Calculators
Related Equipment Terms
Carriers on Reefer
“I added a reefer after three years running dry van. The pay bump is real, but so is the fuel bill for that unit running around the clock on a produce load.”
“Pre-cooling the trailer before the load even gets there has saved me from more than one rejected shipment. It takes ten extra minutes and it matters every time.”