B-COOL 9RM | 12V & 24V DC Powered Roof Mount Air Conditioner

The B-COOL 9RM is a 12V and 24V DC-powered rooftop no-idle air conditioner built for large cab spaces — semi trucks, sleeper cabs, heavy equipment, and any application where you need serious cooling coverage with near-silent operation. At 38 dB it runs as quietly as the 6RM, but with a larger footprint and higher airflow designed to handle bigger interiors. No engine idling. No shore power. No generator. The 9RM runs entirely off your 12V or 24V DC battery system — keeping operators cool, comfortable, and compliant with anti-idling regulations without burning a drop of fuel. At 77 lbs with a 30.4 x 38.2 in footprint, the 9RM is the largest single-fan rooftop unit in the B-COOL lineup. It comes pre-charged and ready to install — cut the roof opening, bolt it down, connect to your battery, and go.