Skip to product information
B-COOL WMB ST 12V 24V wall mount DC split air conditioner for heavy equipment and trucks
  • B-COOL WMB ST 12V 24V wall mount DC split air conditioner for heavy equipment and trucks
  • B-COOL WMB ST split air conditioner complete kit condenser evaporator blower motor hoses
B-COOL WMB ST | 12V & 24V DC Wall Mount Split Air Conditioner for Heavy Equipment & Trucks

B-COOL WMB ST | 12V & 24V DC Wall Mount Split Air Conditioner for Heavy Equipment & Trucks

$888.00
Voltage

The B-COOL WMB ST is a 12V and 24V DC-powered wall and side mount no-idle air conditioner built for installations where roof penetration is not an option. As a split system with standard refrigerant hose connections, the WMB ST gives professional installers full control over placement, hose routing, and charge — with the evaporator mounting on the interior wall or ceiling of the cab and the condenser mounting anywhere on the vehicle exterior with adequate airflow clearance.

No roof cut. No structural compromise. The WMB ST delivers full DC no-idle cooling from a wall or side mount position, charged on-site by a licensed refrigeration technician to the exact specification required for the installation.

At 44 lbs with 350 m³/h of airflow and a 7.5m power cable as standard, the WMB ST is the lightest split system in the B-COOL lineup. Powered entirely by your 12V or 24V DC battery system — no engine idling, no shore power, no generator required.
Technical Specifications

📄 Download Full WMB ST Spec Sheet

Specification 12V 24V
Current Draw (Min – Max)35 – 65A10 – 35A
Evaporator Airflow350 m³/h350 m³/h
Noise Level48 dB48 dB
RefrigerantR134a, 560gR134a, 560g
Connection TypeStandard hose — on-site charge by licensed technicianStandard hose — on-site charge by licensed technician
Mount TypeWall / side mountWall / side mount
Roof Cut RequiredNoNo
Unit Weight44 lbs44 lbs
Evaporator Dimensions20.9 x 7.9 x 15.8 in20.9 x 7.9 x 15.8 in
Standard Power Cable7.5m (25ft)7.5m (25ft)

What's In The Box?
  • B-COOL WMB ST Evaporator Unit (wall / side mount)
  • B-COOL WMB ST Condenser Unit
  • Refrigerant Hoses (standard connection — on-site charging by licensed refrigeration technician required)
  • Remote Control
  • Mounting Hardware Kit
  • Standard Power Cable — 7.5m (25ft)

Note: The WMB ST uses standard refrigerant hose connections that require on-site charging by a licensed refrigeration technician. A vacuum pump and refrigerant handling equipment are required for installation. If you need a wall mount system that does not require refrigerant handling on-site, consider the WMB QC with Quick Connect pre-charged pipes.
Installation Manual

📄 Download Full WMB ST Installation Manual
https://cdn.shopify.com/s/files/1/0715/1140/8684/files/1._WMB_ST_-_INSTALLATION_MANUAL.pdf?v=1772661164

The WMB ST is a split system — the evaporator mounts on the interior wall or ceiling of the cab and the condenser mounts on the exterior of the vehicle. The two units are connected by flexible refrigerant hoses that are charged on-site by a licensed refrigeration technician. No roof penetration required.

A licensed refrigeration technician, vacuum pump, and refrigerant handling equipment are required for installation.

Step 1 — Plan your mounting locations
Determine the best wall or side mounting location for the evaporator inside the cab. Determine the condenser mounting location on the exterior of the vehicle — ensure adequate airflow clearance around the condenser on all sides.

Step 2 — Mount the evaporator
Mount the evaporator unit on the interior wall or ceiling in the chosen location using the included hardware.

Step 3 — Mount the condenser
Mount the condenser unit on the exterior of the vehicle in the chosen location. Ensure adequate airflow clearance on all sides.

Step 4 — Route the refrigerant hoses
Route the refrigerant hoses between the evaporator and condenser through the vehicle body. Route through existing openings, grommets, or custom penetrations as required by the installation.

Step 5 — Connect and charge the refrigerant system
Connect the refrigerant hoses to both units. Evacuate the system with a vacuum pump, then charge with R134a refrigerant to the correct specification. This step must be performed by a licensed refrigeration technician.

Step 6 — Connect the control panel wiring
Connect the control panel wiring between the evaporator and the interior control panel.

Step 7 — Connect power
Run the 7.5m power cable to your 12V or 24V battery bank. Connect positive first.

Step 8 — Set low voltage protection
Before first use, program the voltage cutoff to protect your battery system:

  • 12V systems: set cutoff between 9V – 12V
  • 24V systems: set cutoff between 19V – 24V

Step 9 — Power on
Turn the unit on and verify operation in all modes.
Operating Manual

📄 Download Full WMB ST Operating Manual
https://cdn.shopify.com/s/files/1/0715/1140/8684/files/2._WMB_ST_-_OPERATING_MANUAL_-_2026_-_FINAL.pdf?v=1772661163

Inside Control Panel — 4 Buttons

  • Button A: Power on / off
  • Button B: Mode — cycles through Low / Medium / High / Powerful fixed-frequency cooling
  • Button C (▲): Increase airflow level
  • Button D (▼): Decrease temperature / adjust settings

Remote Control

Power on / off. Temperature range: 60.8°F – 89.6°F.

Cooling modes:

  • High — default 60.8°F, Level 6 airflow
  • Medium — default 78.8°F, Level 4 airflow
  • Low — default 82.4°F, Level 3 airflow
  • Auto — default 78.8°F, Level 4 airflow
  • Fresh Air — fan only, compressor off. Circulates and ventilates without active cooling.

Airflow: 6 adjustable levels via remote or control panel.

Display button: turns the interior cab display on or off.

Low Voltage Protection

The WMB ST includes programmable voltage cutoff to protect your battery system from deep discharge.

  • 12V systems: set cutoff between 9V – 12V
  • 24V systems: set cutoff between 19V – 24V

When battery voltage drops to the cutoff threshold the unit shuts off automatically to prevent battery damage.
Who It's Built For

The WMB ST is the right unit if:

  • Your vehicle cannot or should not have a roof penetration — the WMB ST mounts on the wall or side of the cab with no roof cut required
  • You are a professional installer, dealer, or fleet upfitter who works with refrigerant equipment and wants full control over the hose routing, charge length, and installation process
  • You need custom hose run lengths — the standard hose system allows the installer to cut hoses to the exact length required, unlike the fixed-length pipes of the WMB QC
  • You operate heavy equipment where the cab roof is not accessible or suitable for penetration and the condenser needs to be mounted in a custom location on the vehicle frame or exterior
  • You're building a conversion van, Sprinter, Transit, or Promaster where wall mounting is preferred and a licensed HVAC technician is handling the installation
  • You want a wall mount no-idle DC air conditioner that any licensed refrigeration or HVAC technician can service, recharge, or repair in the field without proprietary fittings

The key difference between the WMB ST and WMB QC is the refrigerant connection method — standard hoses charged on-site versus pre-charged Quick Connect pipes. The WMB ST offers more flexibility for custom installs and is preferred by professional installers who work with refrigerant equipment. The WMB QC is faster to install and requires no refrigerant handling. Both units are identical in performance.

The key difference between the WMB ST and FLEX ST is the evaporator form factor — the WMB ST evaporator is specifically shaped and sized for wall and side mounting, while the FLEX ST has a different profile suited to more varied placement options.

Applications

Heavy Equipment — excavators, bulldozers, motor graders, cranes, mining equipment — wall or side mount where roof penetration is not possible, custom hose routing required

Fleet Upfitting — professional installers who work with refrigerant equipment and prefer standard hose systems over Quick Connect for wall mount applications

Van Conversion & Upfitting — Sprinter, Transit, Promaster, and custom builds where wall mounting is preferred, licensed installer available on-site

Trucking & Transportation — day cabs, specialty trucks, and vehicles where wall or side mount is preferred and a licensed technician is handling installation

Agriculture — tractors and harvesting equipment where cab configuration requires a custom-routed wall mount split system

Off-Grid Solar Builds — battery-powered off-grid vehicles where wall mount positioning, no roof penetration, and custom hose routing are design priorities
FAQ

What is the difference between the WMB ST and the WMB QC?
Both are identical in performance — same specs, same airflow (350 m³/h), same noise (48 dB), same amp draw (35–65A at 12V), same weight (44 lbs), same 7.5m cable. The difference is the refrigerant connection method. The WMB ST uses standard hose connections charged on-site by a licensed refrigeration technician — offering more flexibility in hose run length and full control over the charge. The WMB QC uses pre-charged Quick Connect pipes with no refrigerant handling required and includes a 100A fuse as standard.

What is the difference between the WMB ST and the FLEX ST?
Both use standard refrigerant hose connections and have identical performance specs. The WMB ST evaporator is specifically designed for wall and side mounting. The FLEX ST has a different evaporator profile suited to more varied placement options including ceiling mounting. If wall or side mounting is your application, the WMB ST is the purpose-built choice.

Does the WMB ST require a licensed refrigeration technician?
Yes. The WMB ST uses standard refrigerant hose connections that must be evacuated and charged on-site. This requires a vacuum pump, refrigerant handling equipment, and a licensed refrigeration technician. If you need a wall mount system that does not require refrigerant handling, the WMB QC is the right choice.

Does the WMB ST require a roof cut?
No. The WMB ST mounts on the interior wall or side of the cab. No roof penetration required.

Does the WMB ST work on both 12V and 24V systems?
Yes. The WMB ST is available in both 12V and 24V configurations. Select your voltage when ordering. The unit is wired for one voltage — it is not a dual-voltage unit.

Is this unit compliant with anti-idling regulations?
Yes. The WMB ST runs entirely on DC battery power with no engine idling required, making it fully compatible with anti-idling laws and idle reduction programs across North America.

What battery bank do I need?
At 12V, the WMB ST draws between 35 and 65 amps. Contact our technical support team to size your battery system correctly for your runtime requirements.

What if I need replacement parts?
All WMB ST components are stocked with dedicated part numbers. Contact our Parts Department at adrian@dcpowersales.com or 778-679-4999.
Contact & Support

When you buy from B-COOL, you're not buying from an Amazon storefront with no support. You're buying from the team that wrote the installation manual, stocks the replacement parts, and answers the phone.

Sales & Inquiries
📧 sales@dcpowersales.com
📞 778-590-5000

Technical Support
📧 adrian@dcpowersales.com
📞 778-679-4999


Parts Available in Canada & United States. We stock all parts - compressor, control board, condenser fan assembly, evaporator, blower motor, louver motor, all hoses, hardware and more.
Why B-COOL Does Not List BTU Ratings

Every other brand lists BTU numbers. We don't, and here's why.

BTU ratings in the 12V and 24V air conditioner market are tested in controlled lab conditions and competitors go with their favourite testing company and tend to use those results that depicts them the "best". Real-world performance — inside a truck cab or RV sitting in the sun at 100°F+ — is a completely different story. The numbers you see on competitor listings are inflated, and we are not willing to publish figures that mislead the people who depend on this equipment to stay safe and productive.

Lower amp draw means longer battery runtime. For operators running on batteries overnight, during rest breaks, or in anti-idling zones, the 6RM stretches your power further than any other rooftop option in our lineup.

Compare All B-COOL Models

Model Noise Weight Airflow 12V Amps 24V Amps Special Features Availability
5RM 68 dB 40 lbs 400 m³/h 40 – 75A 11 – 40A Lightest rooftop, simplest install Available to Purchase Online
X7RM 68 dB 48 lbs 400 m³/h 40 – 75A 11 – 40A Cooling + PTC heating (4-season) Pricing Upon Request
6RM 38 dB 60 lbs 310 m³/h 30 – 60A 8 – 33A Quietest small rooftop, lowest amp draw, auto-swing louver Pricing Upon Request
9RM 38 dB 77 lbs 350 m³/h 30 – 70A 8 – 38A Capillary tube, large cab coverage Pricing Upon Request
12RV 28 dB 77 lbs 350 m³/h 30 – 70A 8 – 38A Quietest unit overall, RV square cut, internal filters Pricing Upon Request
12RM Dual Fan 48 dB 99 lbs 400 m³/h 35 – 85A 10 – 45A Dual fan, most modes, Hybrid Control Panel optional Pricing Upon Request
YTRM 48 dB 99 lbs 460 m³/h 35 – 85A 10 – 45A Highest airflow, yard truck built, ignition cut-off Pricing Upon Request
FLEX ST 48 dB 53 lbs 350 m³/h 35 – 65A 10 – 35A Flexible hose routing, split system Available to Purchase Online
FLEX QC 48 dB 53 lbs 350 m³/h 35 – 65A 10 – 35A Quick Connect, split system, 100A fuse included Pricing Upon Request
WMB ST 48 dB 44 lbs 350 m³/h 35 – 65A 10 – 35A Wall/side mount, no roof cut needed Available to Purchase Online
WMB QC 48 dB 44 lbs 350 m³/h 35 – 65A 10 – 35A Quick Connect, wall/side mount, 100A fuse included Pricing Upon Request

Not sure which unit is right for you? Contact our sales team at sales@dcpowersales.com or 778-590-5000 — we'll help you choose.

You may also like