A rooftop air conditioner combines the compressor, condenser and evaporator in one low-profile unit that installs in a roof hatch. Karlesk 12V and 24V rooftop units from 2000 to 3500 W cool vans, campers, truck sleepers and machinery cabs from the battery. GREE 220V rooftop units with heat pump suit motorhomes and caravans on shore power.