Bunk LedgerSleeping beside a reefer (2026)
A refrigerated trailer keeps a setpoint. The unit starts, runs, and stops on its own controls. From the bunk that sounds like a neighbor who will not settle. This page is how to live next to that noise. It does not tell you the setpoint, and it does not tell you to override the unit.
The photo is a refrigerated semi-trailer. It is not a measurement of the noise. There is no decibel figure on this page, because we did not meter the unit.
Noise and light
Earplugs cut some of the roar. They do not remove it, and they make a knock harder to hear. On a team truck, agree how you wake the sleeper. The shared bunk note is that agreement. Take the plugs out before you drive.
The unit's lights and the trailer's markers leak into the sleeper. Curtains that cover the glass help. They must not block the exit. A fan can cover a steady cycle with its own sound if you want that, and it is a battery load if the engine is off. Put it on the power planner.
Park so the unit is not pointed into a space where the noise or the exhaust becomes your problem in a way the site cannot see. You still do not shut it down. A quiet hour is not worth a warm load.
Heat, cold, and the cab
The reefer cools the trailer. It does not cool the cab, and it is not a heater for the bunk. Cab comfort is the cab's own system, a fan, or shore power when you have a matching plug. Do not tap the refrigeration unit for cab power. The cab power note is why those are different machines unless the truck manual says otherwise.
Do not idle the tractor as a sleep strategy this page endorses. Fuel, local rules, and the carrier decide idle. If the engine is off, size the fan to the battery. A space heater on the starting bank overnight is still a bad plan. See shore power.
If the unit alarms, treat the alarm as a cargo and equipment problem. Read the unit's own instructions or call the carrier's reefer line. This page does not list alarm codes.
On a phone, this table moves sideways. The first column stays put.
| Piece | Your move | Leave it |
|---|---|---|
| Noise | Plugs, a fan if you want cover sound | Do not switch the unit off |
| Light | Curtains that still let you exit | Do not cover lamps on the unit |
| Cab temperature | Fan, truck HVAC, or shore power | Do not steal power from the reefer |
| Setpoint | The shipper's spec and the carrier's order | Do not "borrow" a few degrees for quiet |
Live next to the unit without touching the controls
The refrigeration unit cycles because it is holding a setpoint. From the bunk it sounds like it will not settle. You plan for noise and light. You do not shut the unit off so you can sleep. Cargo temperature is the shipper's spec. A quiet hour is not worth a warm load.
Earplugs cut some of the roar. They also make a knock harder to hear. On a team truck, agree how you wake the sleeper before you put them in. The shared bunk note is that agreement. Take the plugs out before you drive. A fan can cover a steady cycle with its own sound. It is a battery load if the engine is off. Add it on the power planner. Do not invent a decibel number. We did not meter the unit. The photo is a trailer, not a measurement.
Light from the unit and the marker lamps leaks into the sleeper. Curtains that cover the glass help if they do not block the exit. Park so you are not inventing a reason to override the controls. You still do not shut it down.
Heat and cold in the cab are a separate system. The reefer is busy with the box. Do not tap it for a CPAP, a fridge, or a heater unless the truck manual says that connection exists. The cab and reefer page is that line. A 1,500 W heater on a starting battery overnight is a bad plan. Shore power, if you have the matching cord, is the feed for a large cab load. Do not coil a loaded cord into a tight pile, and do not backfeed an inverter into a pedestal.
While you wait for a door, the unit stays on. Food and water are the shipper bag. The appointment does not add hours. The window note says call if you will miss it. A probe follows your training, not a guess.
If the noise is bad enough that you cannot sleep at all, the fix is earplugs, a fan, curtains, or a different legal spot if you have one. It is not the off switch. If you feel unwell, that is a clinician, not a colder setpoint.
| You can change | You leave alone |
|---|---|
| Earplugs, a fan, curtains that clear the exit | The reefer controls |
| Where you park, if the spot is legal | A setpoint you were not given |
| Cab loads on the planner or shore power | A tap into the unit |
| The phone call if the door will be missed | Shutting the unit off to rest |
Conclusion
Sleep next to the unit. Do not silence it. Plugs, curtains, and an honest cab-power plan are the tools. The load's temperature is not one of them.
FAQ
How many decibels is a reefer at the bunk?
This page does not know. It depends on the unit, the cycle, and where you parked. We are not printing a number we did not measure.
Can I shut the reefer off for a few hours of sleep?
No. The setpoint is the shipper's spec. Quiet is not a reason to change it.
Will earplugs block the unit completely?
No. They reduce some noise. Agree on a way to wake up that is not a shout, and remove them before you drive.