Start an RV air-conditioning upgrade with a roof plan and an electrical plan. The unit must fit outside and inside the vehicle, and its electrical demand must match the available supply. Selecting only by the largest cooling number can leave expensive installation problems unresolved.
The 2026 product signal
Eberspächer's 2 June 2026 Caravan Salon announcement introduced the Breezonic Slim Power with advertised cooling capacity up to 2.8 kW. The Slim family uses a compact platform and offers different output classes. This makes it a useful example of why physical packaging deserves attention alongside capacity. The announcement is not proof that a particular installation will fit your RV.
Draw three separate envelopes
The first envelope is the rooftop equipment footprint. Include nearby solar panels, roof lights, antennas and access paths. The second is the installation envelope: the opening, structural support and clearances required by the chosen manufacturer's instructions. The third is the indoor envelope, including the air distribution unit, cabinet doors and the space a standing occupant needs.
A housing can fit between two roof accessories while still lacking the required ventilation or service access. Likewise, an acceptable exterior installation may place the indoor outlet directly against a partition. Use the installation drawing for the exact version under consideration, rather than a photograph or a nominal roof-opening dimension.
Keep cooling power separate from electrical input
A 2.8 kW cooling claim describes heat removal under stated conditions. It does not mean the equipment continuously draws 2.8 kW of electricity. Obtain the rated supply, input range, starting behavior and operating limits. If an inverter or battery system is involved, assess it as part of the complete electrical installation.
At a campsite, other appliances also consume the available supply. Before buying, list the loads that will run simultaneously and ask the installer to check that combination. A reduced starting demand does not remove the need to check continuous demand and protective devices.
Make the purchase decision measurable
Ask for an annotated roof drawing, the completed installed weight, an electrical compatibility statement and a maintenance-access plan. During commissioning, check airflow where people sit and sleep, and verify that the chosen operating mode meets the agreed comfort requirement. Preserve the drawings with the vehicle records so that a future solar or antenna upgrade does not compromise the AC installation.
Next step
Compare the available configurations in the Vethy product catalog, then request the current model-specific documentation before selecting a unit.