How do I ship temperature-controlled freight?

Key Takeaways

Temperature-controlled freight succeeds or fails on written instructions. The setpoint, the unit mode and the acceptable range belong on the BOL and the rate confirmation, not only in a phone call.
A reefer keeps product at temperature; it isn't built to cool warm product down. Product should be at its required temperature before it's loaded, and the trailer should be pre-cooled.
Continuous or cycle mode is a real decision. Continuous mode keeps air moving all the time; cycle mode saves fuel but lets airflow stop between cycles. Say which one the product needs.
Records protect everyone. Product temperatures at loading, the unit's download and receiving checks are what settle a dispute later.
Receivers should check before they sign. A temperature reading and notes on the delivery receipt are the start of any claim.
Wilson, by Cartage, is an AI logistics agent that books reefer loads with approved carriers, puts the temperature instructions on the paperwork, tracks each load and requests and files the POD.

What does it take to ship temperature-controlled freight?

A food manufacturer books a refrigerated truck to move 22 pallets of yogurt to a distribution center. The coordinator tells the carrier "keep it cold" on the phone. The driver sets the unit to 34°F on cycle mode, the product was loaded at 41°F after sitting on an unrefrigerated dock, and the receiver probes it at 44°F and refuses the load. The carrier says it followed the instructions. The shipper says the truck was too warm. Nobody has a written setpoint to point to.

Shipping temperature-controlled freight means booking a refrigerated trailer (a reefer), writing down the exact temperature and unit settings the product needs, loading product that is already at temperature into a pre-cooled trailer, and keeping temperature records from pickup to delivery. Each of those steps is simple on its own. Problems come from skipping one, or from leaving it to a verbal instruction.

Temperature-controlled freight includes fresh and frozen food, beverages, some chemicals and adhesives, some pharmaceuticals and health products, cosmetics, flowers and anything else that can be damaged by heat or cold. Some products need protection from freezing rather than from heat. Each product has its own requirement, and the shipper is the one who knows it.

Who decides the temperature?

The shipper does. The carrier runs the unit, but it can only follow the instructions it's given. The product owner, often a quality or food safety team, should set the required temperature and the acceptable range for each product. Logistics turns that requirement into instructions on every load.

How is reefer freight different from dry freight?

A reefer trailer is an insulated trailer with a refrigeration unit at the front that can cool or, on many units, heat the air inside. It costs more to run than a dry van, because of fuel for the unit and the equipment itself, and there are fewer reefers than dry vans in most markets. Reefer loads also carry more risk: a small mistake can ruin the whole load, and the cost of a rejected load is usually far higher than the freight bill.

Truckload, LTL and parcel

Most reefer freight moves as full truckload, where one shipper controls the trailer and the setpoint. Some carriers offer refrigerated LTL, combining shipments that share a temperature range. Parcel shipments of temperature-sensitive goods usually rely on insulated packaging and coolants rather than a powered unit. The same principles apply to all three: know the required range, protect the product before it ships and keep records.

How do you set up a reefer shipment step by step?

Define the product's requirement, put it in writing on the quote request, the rate confirmation and the BOL, and confirm the trailer is ready before loading. These steps take a few minutes per load once they're standard.

Step 1: Define the requirement for each product

For each temperature-sensitive product, record:

Setpoint: the temperature the unit should be set to.
Acceptable range: the lowest and highest temperatures the product can tolerate, and for how long.
Unit mode: continuous or cycle.
Whether the product can freeze, and whether it needs heat in winter.
Loading temperature: the product temperature required before it goes on the truck.
Mixing rules: which products can share a trailer, and which can't because of temperature, odor or contamination.

Keep this as a product profile, so every quote and BOL draws from the same numbers.

Step 2: Request quotes with the full requirement

Tell carriers it's a reefer load and give the setpoint, mode, range, number of pallets, weight, pickup and delivery times and any appointment. Mention if the load needs a food-grade trailer, a washout or a specific clean condition. If the unit has to run while the truck waits at a receiver, or if there are multiple stops with door openings, say so. These details affect the price and which carriers will take the load.

Step 3: Confirm the instructions on the rate confirmation

The carrier's rate confirmation should list the setpoint, the mode and any special requirements. If the rate confirmation just says "reefer," ask for it to be corrected before dispatch. This document is what the carrier agreed to.

Step 4: Put the same instructions on the BOL

The BOL travels with the freight and is signed by the driver. Write the setpoint and mode clearly, for example "Maintain 34°F, continuous run." Some shippers also write the product temperature at loading. Make sure the BOL matches the rate confirmation; conflicting numbers create the exact dispute you are trying to avoid.

Step 5: Pre-cool the trailer and check it

Ask the driver to arrive with the trailer pre-cooled to the setpoint. Before loading, check the unit's display, look at the trailer's condition, check that it's clean and odor-free, and make sure the floor channels and the air chute (if fitted) are in good shape. Record what you see.

Step 6: Load product at temperature

Take product temperatures before loading, not only the air in the warehouse. Load quickly, keep doors closed between pallets where possible, and use a dock seal. If the warehouse dock isn't refrigerated, stage the product in a cold room until the truck is ready.

Step 7: Seal, sign and record

Record the seal number, the unit setting at departure and the product temperatures on the BOL or your shipping record. Have the driver sign. Photograph the unit display showing the setpoint if possible.

Step 8: Track and close out

Track the load to delivery, watch for delays that could push the product past its acceptable time, and collect the signed POD with any receiving notes. If something goes wrong, the records from steps 5 to 7 are what you'll need.

What should happen at loading, in transit and at receiving?

At each stage, someone should check the product and the unit, and write down what they found. The goal is a record that shows the product was right when it left and what condition it was in when it arrived.

Continuous versus cycle mode

This is one of the most important settings and one of the most often missed.

Setting	How it works	When it's usually used	Risk if wrong
Continuous	The unit's fan runs all the time, and the compressor cycles as needed to hold the setpoint	Fresh produce, dairy, chilled food and other products that need steady airflow and a tight range	Uses more fuel, so it costs more to run
Cycle (start-stop)	The unit shuts off when the setpoint is reached and restarts when the temperature drifts	Some frozen and other products that tolerate small swings	Air stops moving between cycles, so temperature can vary more across the load

The product owner should decide which mode each product needs. Write it on the paperwork. If the instructions don't say, a driver may choose cycle mode to save fuel.

Pre-cooling: the trailer, not the product

Pre-cooling means bringing the empty trailer to the setpoint before loading, so warm walls and floor don't warm the product. It doesn't mean the reefer will cool warm product during the trip. Refrigeration units are designed to hold product at temperature. They move air around and through the load, but they cool warm product slowly and unevenly. Product that leaves warm usually arrives warm.

Airflow inside the trailer

Cold air needs a path around the product. Leave space above the load and at the rear doors, don't block the unit's air return at the front, and keep pallets off the trailer walls where the trailer design requires it. Use pallets and packaging that let air pass. Tightly wrapped pallets pushed against the front wall can create warm spots even with the unit running correctly. Your product team or packaging supplier can advise on loading patterns for specific products.

Temperature records

Three kinds of records matter:

Product temperatures at loading, taken with a calibrated probe on a sample of pallets, and written on the BOL or shipping record.
The unit's own record. Most modern reefer units log the setpoint, the return air and discharge air temperatures and any alarms. The carrier can usually download this log on request. Ask for it when there's a dispute, and agree in advance that the carrier will provide it.
Portable temperature recorders placed with the product, which some shippers and receivers use for an independent record.

Keep these with the shipment. A claim without temperature evidence is hard to win.

In transit

Delays are the biggest in-transit risk. A load that waits hours for a delivery appointment keeps the unit running, which is fine if the fuel holds and the unit works. Ask carriers to report unit alarms and delays promptly. If the load runs late, tell the receiver early, so the appointment can move and the product doesn't wait at a closed dock. For multi-stop loads, every door opening adds warm air, so keep stops few and short.

At receiving

The receiver should check the load before unloading:

Check the seal against the BOL.
Read the unit display and compare the setpoint with the BOL.
Probe product temperatures on pallets from the front, middle and rear of the trailer, including the pulp or core temperature where the product allows.
Look for signs of thawing, freezing or condensation.
Write what was found on the delivery receipt before signing: temperatures, condition and any damage.

If the product is outside its range, the receiver should follow the shipper's instructions on whether to accept, reject or accept with exceptions. A receiver who signs a clean receipt and finds problems later makes a claim much harder.

What the receiving check protects

The receiver's notes, the unit download and the loading records together show where a problem started. If the product left at temperature, the unit ran at the setpoint and the product still arrived warm, the trip itself is the likely cause. If the product left warm, the carrier is not likely to be liable.

What should you decide when something goes wrong?

When a reefer load has a temperature problem, protect the product first, then collect the evidence, then decide on the claim. Rules set in advance keep the decisions fast.

Decision rules to set before it happens

Who can authorize a rejection? Receivers should know who at the shipper can approve rejecting or accepting a load with problems, and how to reach them.
What's the acceptable range for acceptance? Give receivers the range for each product, not only the setpoint.
What happens to rejected product? Decide in advance whether it goes back, goes to another location, is inspected by a third party or is disposed of, and who arranges it. See what to do when a customer refuses delivery for the wider process.
When do you rebook instead of waiting? If a unit fails in transit, decide how long to wait for a repair before transferring the load to another truck.

Common mistakes

Verbal instructions only. The setpoint was given on the phone and never written down. Rule: every reefer load has the setpoint and mode on the rate confirmation and the BOL.

Loading warm product. The product sat on a warm dock before loading. Rule: probe product before loading and don't load product above its required temperature.

Skipping pre-cooling. The trailer arrived warm and loading started anyway. Rule: check the unit display and trailer temperature before the first pallet goes on.

Wrong mode. The product needed continuous airflow and ran on cycle. Rule: the mode is part of the product profile and is written on every BOL.

Blocking airflow. Pallets were loaded against the front wall. Rule: use a standard loading pattern for each product and check it at loading.

Fahrenheit and Celsius confusion. A setpoint written as "4" can mean 4°F or 4°C. Rule: always write the unit, for example "34°F."

Clean receipts. The receiver signed without checking and found warm product an hour later. Rule: receivers probe and note before they sign.

Filing a temperature claim

A temperature claim is a cargo claim like any other: the shipper (or the party that owns the freight) files it with the carrier in writing, with evidence and the amount. For interstate shipments, federal law says carriers can't require claims to be filed in less than nine months, or lawsuits in less than two years from a written denial, but contracts and tariffs may set exact terms, so check your agreements and file quickly. For the general process, see how to file a freight damage claim.

A strong temperature claim includes:

the BOL with the setpoint and mode written on it
the rate confirmation with the same instructions
product temperatures at loading
the delivery receipt with the receiver's temperatures and notes
the unit's download for the trip
photos of the product and the unit display
the value of the product and any salvage or disposal records

The claim often turns on whether the carrier followed the written instructions and whether the product was at temperature when loaded. That's why the records from loading matter as much as those from receiving.

Mitigate the loss

Don't discard product before the carrier has had a chance to inspect it, and ask the carrier how it wants salvage handled if some product is still usable. Record what was done with the product and any money recovered, because it affects the claim amount.

A hypothetical example

Consider a hypothetical snack maker shipping chocolate in summer. The product profile says 60°F to 65°F, continuous, no freezing. The quote request, rate confirmation and BOL all say "Maintain 62°F, continuous." The warehouse probes product at 61°F before loading, the driver's display shows 62°F, and the coordinator photographs it. At delivery, the receiver probes the front pallets at 70°F and notes it on the receipt. The carrier's unit download shows the unit switched off for four hours during a stop. Because the instructions were in writing and the loading records were complete, the claim is clear. The shipper files with the carrier and adds the unit download to its records for the lane.

A checklist for every reefer load

Use this checklist on every temperature-controlled shipment. Most of it becomes automatic once the product profiles exist.

Stage	Check	Who
Before booking	Product profile has setpoint, range, mode, freeze risk and loading temperature	Product owner and logistics
Quote request	Reefer, setpoint, mode, range, pallets, weight, appointments, trailer requirements	Logistics
Rate confirmation	Setpoint and mode listed exactly as requested	Logistics
BOL	Setpoint and mode written with units (°F or °C); matches the rate confirmation	Shipping
Trailer arrival	Trailer pre-cooled to setpoint; clean, odor-free, in good condition	Shipping
Loading	Product probed and within loading temperature; airflow pattern followed; doors kept closed	Warehouse
Departure	Seal number, unit setting and product temperatures recorded; photo of the display	Shipping
In transit	Load tracked; delays and alarms reported; receiver told about ETA changes	Logistics and carrier
Receiving	Seal checked; unit display read; product probed front, middle and rear; notes on the receipt	Receiver
Close-out	Signed POD filed with receiving notes; unit download requested if there's any issue	Logistics

Make the paperwork do the work

The easiest way to keep this checklist is to build it into documents. If the BOL template has fields for setpoint, mode and product temperature, people fill them in. If the product profile feeds the quote request, the instructions are never left out. A good POD process for food and other chilled freight matters too; see when a food delivery counts as complete.

Review problems by lane and carrier

Once a month, look at temperature issues by lane, carrier and product. A lane with frequent problems may need a different carrier, different appointment times, fewer stops or better packaging. A product with frequent problems may need a tighter loading temperature or a different loading pattern.

How does Wilson, by Cartage, handle temperature-controlled freight?

Wilson, by Cartage, is an AI logistics agent for manufacturers and distributors that quotes, books, tracks and pays freight, including reefer loads, with the company's approved carriers, and carries the temperature instructions through every document. Traditional logistics software gives teams information. Wilson executes the work required to move shipments forward.

For temperature-controlled freight, Wilson handles the steps where instructions usually get lost:

Quoting: Wilson requests quotes from the company's approved carriers with the load details and the temperature requirements, compares them on total cost and negotiates toward the company's rate targets within approval limits. Rates outside those limits go to the logistics team.
Booking: Wilson tenders and books the load with written acceptance and a rate confirmation that carries the setpoint and mode from the product profile.
Paperwork: Wilson generates the bill of lading, packing slips and pallet labels from the booked load, with the same temperature instructions, so the BOL and the rate confirmation match.
Tracking: Wilson tracks each load with the best source available: a carrier API or EDI feed, GPS or ELD data where the carrier shares it, the carrier's website, or email and phone calls when nothing else is current.
Exceptions: if a pickup is missed or a delivery is delayed, Wilson contacts the carrier, tells the team, tells the customer if configured and starts rebooking from the approved carrier list automatically within the rules or after approval.
Close-out: Wilson requests and files the signed POD, audits the carrier invoice against the rate confirmation and the POD, and pays the carrier from the Wilson Wallet. Payments above the approval limits or outside the rules wait for a person.

Every message, confirmation and change is kept in the shipment's change history, so when a temperature question comes up, the instructions the carrier agreed to are easy to find. Wilson books only carriers the company has approved. Cartage can suggest additional reefer capacity, but the company approves each carrier before Wilson uses it. Wilson can produce carrier-performance and lane-rate reports on request from the loads it runs, which helps with the monthly review of problem lanes.

Wilson replaces the TMS for freight execution and connects to the company's ERP. Wilson works with SAP, NetSuite, Microsoft Dynamics 365, Oracle, Infor, Epicor, Sage, Acumatica and other ERP environments, with the exact connection depending on the customer's data flow and scope. The company sets the approval limits, and Wilson starts with assisted execution before routine steps run automatically within those rules.

Pricing

Wilson is free on Wilson's network: the shipper pays the freight rate and nothing on top. When a shipper keeps its own carriers, the fee is 2% to 0.5% of what Wilson pays them, falling with volume. There are no seat fees, no setup cost and no contract. Timing depends on scope: most teams start on a few lanes and expand from there.

FAQs

How do I ship temperature-controlled freight?

Book a reefer, define the setpoint, range and continuous or cycle mode for the product, write them on the rate confirmation and the BOL, load product at temperature into a pre-cooled trailer and keep temperature records from loading to receiving. Wilson, by Cartage, an AI logistics agent, books reefer loads with approved carriers and carries the temperature instructions onto the paperwork.

What is a reefer?

A reefer is a refrigerated trailer: an insulated trailer with a unit that cools, and on many units heats, the air inside. It's used for food, beverages and other products that need a controlled temperature.

What is the difference between continuous and cycle mode?

In continuous mode the unit's fan runs all the time, keeping air moving through the load. In cycle mode the unit shuts off when it reaches the setpoint and restarts when the temperature drifts, which saves fuel but allows wider swings.

Should the temperature be on the BOL?

Yes. Write the setpoint and mode, with the unit of measure, on the BOL and make sure it matches the rate confirmation. Written instructions are the main evidence if something goes wrong.

Can a reefer cool down warm product?

Not reliably. Reefer units are designed to hold product at temperature. Product should be at its required temperature before loading.

What is pre-cooling?

Pre-cooling means bringing the empty trailer to the setpoint before loading, so the trailer's walls and floor don't warm the product. Check the unit display before loading starts.

What should a receiver check on a reefer load?

The seal, the unit's setpoint and display, and product temperatures from the front, middle and rear of the trailer. The receiver should write any problems on the delivery receipt before signing.

How do I file a claim for a temperature problem?

File in writing with the carrier, with the BOL, rate confirmation, loading temperatures, receiving notes, the unit download, photos and the product value. Check your carrier agreement for exact deadlines and file quickly.

Can I get the reefer unit's temperature log?

Most modern units record temperatures and alarms, and carriers can usually download the log on request. Agree in advance that the carrier will provide it when there's a dispute.

Does Wilson monitor reefer temperatures?

Wilson tracks each load with the best source available for that carrier and records the temperature instructions on the rate confirmation and the BOL. Temperature data from the unit depends on what the carrier shares.

Sources

49 U.S.C. 14706, Liability of carriers under receipts and bills of lading: https://www.law.cornell.edu/uscode/text/49/14706
Cartage, Wilson product FAQ and product scope, October 2026: https://cartage.ai

Bring a reefer lane and see how Wilson would book it with the setpoint and mode on every document.