Will this drain my starting battery?

No! We recommend installing a battery isolator to protect your starting battery. The AC runs on your house batteries.

How long does it run on batteries?

With a 400 Ah battery bank, expect 6-10 hours of runtime depending on ambient temperature.

Can I install this myself?

Yes! If you're comfortable with basic electrical work and power tools, DIY installation takes 4-6 hours.

Does this work with solar panels?

Absolutely! We recommend 400-800W of solar panels for optimal off-grid performance.

B-COOL 5RM 12V rooftop air conditioner for semi truck

B-COOL 5RM | 12V & 24V DC Rooftop Air Conditioner for Semi Trucks, RVs & Vans

$888.00

The B-COOL 5RM is the lightest, simplest, and most accessible rooftop no-idle air conditioner in the B-COOL lineup. At just 40 lbs with a 27.5 x 27.5 in footprint and the most straightforward installation of any unit we make, the 5RM is the starting point for operators who need reliable 12V or 24V DC rooftop cooling without the weight, complexity, or cost of a larger unit.

It delivers 400 m³/h of airflow in the most compact and lightweight rooftop package we offer. No engine idling. No shore power. No generator. The 5RM runs entirely off your 12V or 24V DC battery system, keeping operators cool and compliant with anti-idling regulations without burning a drop of fuel.

At $888 it is the only B-COOL unit available at a fixed online price, making it the easiest entry point into DC no-idle air conditioning for owner-operators, small fleets, and first-time buyers.

📄 Download Full 5RM Spec Sheet

Specification	12V	24V
Current Draw (Min – Max)	40 – 75A	11 – 40A
Evaporator Airflow	400 m³/h	400 m³/h
Noise Level	68 dB	68 dB
Refrigerant	R134a, 350g	R134a, 350g
High Pressure	145 – 188 psi	145 – 188 psi
Low Pressure	29 – 43 psi	29 – 43 psi
Roof Cut Size	13.78 x 7.87 in	13.78 x 7.87 in
Unit Weight	40 lbs	40 lbs
Exterior Dimensions	27.5 x 27.5 x 5.9 in	27.5 x 27.5 x 5.9 in
Standard Power Cable	6m (20ft)	6m (20ft)
Optional Power Cable	10.5m (35ft), sold separately	10.5m (35ft), sold separately
Price	$888	$888

B-COOL 5RM Rooftop Air Conditioning Unit (pre-charged, ready to install)
Remote Control
Rubber Gasket
Support Brace x1
Decorative Panel (optional interior finish)
Install Screws & Hardware Kit
Standard Power Cable — 6m (20ft)

Unit comes pre-charged with R134a refrigerant. No vacuum pump or refrigerant equipment needed for installation.

Optional: 10.5m (35ft) power cable available separately from our Parts Department.

📄 Download Full 5RM Installation Manual
https://cdn.shopify.com/s/files/1/0715/1140/8684/files/1._5RM_-_INSTALLATION_MANUAL_-_2026_-_FINAL.pdf?v=1772662487

The 5RM is a self-contained rooftop unit — compressor, condenser, and evaporator all housed in one unit that mounts on top of the vehicle. No refrigerant lines to run. No separate condenser to mount. The unit ships pre-charged with R134a and is ready to run straight out of the box. Of all the rooftop units in the B-COOL lineup, the 5RM has the simplest and most straightforward installation.

Professional installation required.

Step 1 — Cut the roof opening
Cut a 13.78 x 7.87 in (35 x 20 cm) rectangular opening in the roof. Measure twice before cutting.

Step 2 — Prepare the mounting surface
Apply the rubber gasket and sealant around the opening to create a weatherproof seal.

Step 3 — Set the support bolts
Adjust the support bolts to the correct height for your specific roof thickness before setting the unit.

Step 4 — Mount the unit
Set the 5RM onto the roof opening and secure it with the included support brace.

Step 5 — Connect the control panel wiring
Run the control panel wiring through the roof and connect to the interior control panel.

Step 6 — Connect power
Run the power cable to your 12V or 24V battery bank. Connect positive first. The standard cable is 6m (20ft). An optional 10.5m (35ft) cable is available from our Parts Department if needed.

Step 7 — 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 8 — Finish interior
Install the optional decorative panel on the interior ceiling for a clean finish.

Step 9 — Power on
Turn the unit on and verify operation.

📄 Download Full 5RM Operating Manual
https://cdn.shopify.com/s/files/1/0715/1140/8684/files/2._5RM_-_OPERATING_MANUAL_-_2026.pdf?v=1772662486

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 5RM 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.

The 5RM is the right unit if:

You need a reliable 12V or 24V DC rooftop no-idle air conditioner at the best entry price in the B-COOL lineup — the 5RM is the only unit available at a fixed online price of $888
You're an owner-operator, small fleet, or first-time buyer looking for a straightforward no-idle AC solution without the complexity or cost of a larger unit
You drive a semi truck, sleeper cab, day cab, or long haul truck and need anti-idling compliant cooling that runs off your auxiliary battery
You have an RV, motorhome, or camper van and need a rooftop DC air conditioner that installs quickly and reliably
You operate heavy equipment — excavators, tractors, construction equipment — and need a simple rooftop cooling solution
Weight is a factor — at 40 lbs the 5RM is the lightest rooftop unit in the B-COOL lineup, 8 lbs lighter than the X7RM and 20 lbs lighter than the 6RM
You want maximum airflow (400 m³/h) in the lightest, most affordable rooftop package we make

The 5RM uses the same 13.78 x 7.87 in roof cut as the X7RM — making it directly upgradeable to the X7RM (with PTC heating) at any time without re-cutting the roof. If you think you may want heating capability in the future, the 5RM is the right starting point.

Applications

Trucking & Transportation — semi trucks, sleeper cabs, long haul trucks, day cabs, tanker trucks, flatbed trucks — anti-idling compliance and overnight rest

Recreation & Off-Grid — RVs, motorhomes, camper vans, travel trailers, fifth wheels — straightforward rooftop DC cooling for weekend and full-time use

Heavy Equipment — excavators, bulldozers, wheel loaders, cranes — simple reliable rooftop cooling for equipment cabs

Agriculture — tractors, harvesters, sprayers — reliable DC cooling for long days in the field

Construction — site vehicles, service trucks, equipment cabs — best entry price no-idle AC for small fleets and contractors

Emergency Services — response vehicles, service units — lightweight reliable rooftop cooling

Does the 5RM work on both 12V and 24V systems?
Yes. The 5RM 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.

Why is the 5RM the entry-level unit?
The 5RM delivers the same 400 m³/h airflow as the X7RM and 12RM Dual Fan in the lightest (40 lbs) and most affordable package in the lineup. It has a straightforward 4-button control panel and standard cooling modes — no additional features like PTC heating, dual fans, or Sleep and Turbo modes. For operators who need reliable DC no-idle cooling without extras, the 5RM is the right choice.

Can I upgrade from the 5RM to the X7RM later?
Yes. The 5RM and X7RM use the identical 13.78 x 7.87 in roof cut. If you start with a 5RM and later want to add PTC heating capability, the X7RM drops into the same opening with no re-cutting required.

Does it come pre-charged?
Yes. The 5RM ships pre-charged with R134a refrigerant and is ready to install. No vacuum pump or refrigerant equipment needed.

What size hole do I need to cut?
13.78 x 7.87 inches (35 x 20 cm). Measure twice before cutting.

Is this unit compliant with anti-idling regulations?
Yes. The 5RM 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.

How does the 5RM compare to the 6RM?
The 5RM is lighter (40 lbs vs 60 lbs), louder (68 dB vs 38 dB), has higher airflow (400 m³/h vs 310 m³/h), and draws more power (40–75A vs 30–60A at 12V). The 5RM is the better choice when price and weight are the priorities. The 6RM is the better choice when quiet operation and low power draw matter most.

What battery bank do I need?
At 12V the 5RM draws between 40 and 75 amps. Contact our technical support team to size your battery system correctly for your runtime requirements.

Is a longer power cable available?
Yes. A 10.5m (35ft) optional power cable is available separately from our Parts Department.

What if I need replacement parts?
All 5RM components are stocked with dedicated part numbers. Contact our Parts Department at adrian@dcpowersales.com or 778-679-4999.

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.

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