Portable Split AC Caravan Mounting: RV and Motorhome Guide

For caravan owners, the appeal of a portable split air conditioner over a roof-mounted system is considerable: no roofer, no permanent penetration, no loss of headroom, and the system travels with you when you sell the van. The challenge is mounting — the outdoor unit of a portable split typically weighs 12–16 kg and must sit securely outside the caravan during use, passing its refrigerant hoses through a window or custom aperture panel into the cooled habitation space.

Why choose a portable split over a fixed caravan air conditioner?

A portable split air conditioner suits caravan use because it requires no permanent roof penetration, no gas engineer, and no specialist installation — the outdoor unit mounts on a bracket outside a window while refrigerant hoses pass through the opening. For static-site caravans and seasonal tourers, this is a genuine alternative to Dometic or Truma roof systems costing €1,200–2,500 installed, with the added benefit of the entire system remaining owner-removable.

Fixed caravan air conditioning dominates new-unit sales, but the installed cost and the permanent roof penetration make it unviable for many older caravans and budget-conscious owners. A portable split draws from the caravan's EHU (External Hook-Up — the 230 V, 16 A shore-power connection provided at most European campsites via a CEE 17 blue-collar connector) without additional wiring, and its outdoor unit creates no permanent fixings that would affect the caravan's resale value or void its manufacturer warranty.

How do you mount the outdoor unit of a portable split outside a caravan window?

The outdoor unit mounts outside a caravan window using one of three approaches: a wall-mounting bracket bolted to the exterior cladding, a free-standing ground frame positioned beneath or beside the window, or a window-frame clamp bracket that grips the aperture without drilling into the caravan body. Each solution positions the unit so the refrigerant hoses pass through a gap in the open window or a custom foam-board panel insert filling the window aperture.

The most secure option for static-site caravans is a wall-mounted bracket fastened through the exterior cladding into the caravan's structural chassis — typically 40 x 40 mm aluminium extrusion on modern European caravans. A bracket rated for at least 20 kg at 300 mm standoff is appropriate for most 9,000 BTU outdoor units weighing 12–16 kg assembled. M8 coach bolts with 80 x 80 mm backing plates spread the load through the sandwich-construction cladding and prevent pull-through of the polystyrene core.

The free-standing ground-frame option avoids all drilling and suits tourers who frequently move between sites. The outdoor unit rests on a weatherproof powder-coated steel frame that sits on level ground beside the caravan, stabilised if needed with ratchet straps to the tow bar or awning rail. At 12–16 kg, the unit is stable in calm to moderate wind; on exposed sites or in gusty conditions above approximately 25 km/h, additional strapping is recommended as a precaution.

The transit edge case: what happens to the refrigerant circuit when the caravan is towed?

A question static-site buyers rarely ask but touring owners must consider: does road vibration damage the refrigerant circuit? The answer is no, provided the outdoor unit is stored inside the caravan or in an external locker during transit — not left on a bracket — and the hoses are disconnected and capped at the outdoor unit's dry-break couplings. The compressor's lubricating oil may pool slightly during a long journey; allowing a two-minute idle after arrival, before the unit reaches operating temperatures, ensures oil redistribution before the compressor loads up.

What power supply does a portable split AC need at a European campsite?

A 9,000 BTU portable split at maximum load draws approximately 750–900 W from a 230 V supply. This sits well within the 16 A (3,680 W) capacity of a standard European EHU hook-up, leaving margin for a 12 V compressor refrigerator, LED lighting, and device charging simultaneously. On a 10 A pitch (2,300 W), the same split runs at full rated load without tripping the pitch's RCD (residual current device — a fast-acting safety switch that cuts power when it detects current leaking to earth).

Generator operation is equally practical: a 2,000 W inverter generator — the Honda EU22i class or equivalent — sustains a 750–900 W portable split at full load with comfortable overhead. At 750 W over 8 hours per night, the unit adds approximately 6 kWh to the EHU meter, equating to roughly €1.50–2.50 per night at typical European campsite electricity rates of €0.25–0.42 per kWh — modest compared to the cost of a Dometic rooftop system's installation.

How do you route and seal refrigerant hoses through a caravan window?

The cleanest hose routing uses a custom-cut foam board or 4 mm polycarbonate panel filling the open portion of the window, with two holes cut for the refrigerant hose pair (combined diameter typically 60–70 mm for a 9,000 BTU unit). EPDM (ethylene propylene diene monomer — a dense synthetic rubber foam tape used in automotive and caravan sealing, resistant to UV, ozone, and temperature cycling) compresses around the panel edge and hose collars to block draughts and prevent condensation bridging.

The panel stores flat behind a caravan seat squab when the unit is packed for transit, and reassembly at a new site takes under ten minutes once the system is familiar. A 10–15 mm bead of EPDM self-adhesive tape around the panel perimeter and a 20 mm split-foam collar around each hose creates a draught and vapour seal the window can press closed against. The condensate drain hose from the indoor unit can be routed through a third smaller hole in the same panel, exiting to the outside.

In van and caravan communities, owners who have converted to portable split cooling describe the experience as genuinely transformative for summer touring — the consensus being that 15–20 minutes of setup at each new site is a very acceptable trade for a comfortable sleeping temperature, and that the outdoor unit's weight during transit is the main friction point to plan around.

What are the practical limits of portable split AC in a caravan?

• Caravan insulation is thin: composite wall panels of 32–50 mm total thickness carry U-values (thermal transmittance — the rate of heat transfer through a structure, in W/m²K) of 0.7–1.5 W/m²K versus 0.18 W/m²K for a modern insulated house wall, meaning the cooling load per square metre is proportionally much higher. A 9,000 BTU split comfortably cools a 6-metre caravan to 22 °C in 28 °C ambient; above 33 °C ambient without awning shading it will struggle to maintain that set point.
• Awning shading is highly effective: deploying the awning on the sun-facing side reduces solar heat gain through the thin sidewalls and roof by 30–50%, substantially reducing the split's duty cycle and running cost.
• GVWR must be checked: adding a 14–16 kg outdoor unit and steel bracket to the caravan's side shifts the payload allocation. Verify the caravan's GVWR (Gross Vehicle Weight Rating — the maximum permitted laden mass including all occupants, gear, and fitted equipment) before adding permanent bracket hardware, particularly on single-axle caravans with tighter payload margins.
• Condensate volume is significant: the indoor fan-coil produces 0.5–1.5 litres of condensate (liquid water condensed from humid room air on the cold evaporator surface) per hour in summer conditions. Route the gravity drain hose through the window panel to the outside; if the hose is too short to reach, a small condensate pump adds approximately £25–40 and eliminates the need for manual emptying.

Portable split units suited to caravan use — compact outdoor unit, pre-charged dry-break hoses, 9,000 BTU capacity — sell out rapidly at the start of the European camping season, frequently by March or early April.