Everything You Need To Know About Your Caravan’s Air Conditioner

A roof-mounted air conditioner is standard equipment on most new caravans and the single most effective way to manage temperature inside the van. It cools in summer, heats in winter (reverse-cycle models), and dehumidifies in humid conditions. The limitation that every caravanner needs to understand: it draws significant power, and that determines when and where you can use it.

How It Works

A caravan air conditioner is a self-contained reverse-cycle unit mounted on the roof, with the air distribution unit visible inside the van (usually a ceiling cassette). It works identically to a home split system: a compressor circulates refrigerant that absorbs heat from inside the van and expels it outside (for cooling) or the reverse (for heating).

Most caravan units are rated at 2.5 to 3.5kW cooling capacity, which is adequate for vans up to about 22 feet. Larger vans may need a larger unit or supplementary cooling.

Power Requirements

This is the critical detail. A caravan air conditioner draws 1,500 to 2,500W (6 to 10 amps at 240V). It needs a 240V power source: either a powered site at a caravan park, a generator (minimum 2,500W capacity to handle startup surge), or a large inverter connected to a substantial lithium battery bank.

At a powered site: The air con runs off the site’s power. Most sites provide 10-amp or 15-amp outlets. On a 10-amp outlet (2,400W maximum), the air con takes up most of the available power. Running it simultaneously with a kettle, microwave, or hot water element will likely trip the breaker.

Off-grid: Running an air conditioner off batteries is technically possible but requires a serious setup: typically 400Ah+ of lithium battery, a 3,000W+ inverter, and substantial solar (500W+) to recover. This is an expensive upgrade ($5,000 to $10,000+) and still only provides a few hours of cooling per day without mains top-up. For most Big Lappers, the air con is a powered-site luxury, not an off-grid tool.

Common Brands

Dometic: The most common brand in Australian caravans. The Dometic Harrier Inverter ($2,500 to $3,200) is the most popular aftermarket upgrade: inverter technology means lower power draw and quieter operation than older fixed-speed units. The Dometic FreshJet 3000 ($3,000 to $3,800) is the premium option with the lowest noise levels and best efficiency. Older Dometic Ibis units are still found in many factory-fitted caravans and work fine but are noisier.

Truma Aventa: German-engineered, known for quiet operation. The Truma Aventa Eco ($2,800 to $3,500) is popular in premium caravans and is one of the lightest units available at around 30 kg, which matters for roof weight and ATM. The Truma Saphir under-bench unit ($3,500 to $4,500) is an alternative for vans where roof mounting isn’t ideal.

Houghton Belaire: Australian brand. The Belaire Mark III ($1,200 to $1,800) offers good cooling performance at a competitive price point. Heavier and louder than the Dometic Harrier or Truma, but significantly cheaper. A reasonable choice if budget is the priority.

Maintenance

Clean the filters monthly. The return air filter inside the van collects dust and reduces airflow when dirty. A quick vacuum or wash keeps the system efficient.

Clean the condenser annually. The external coils on the roof collect dirt, leaves, and debris. A gentle hose-down (not high pressure) keeps airflow through the condenser optimal.

Check the roof seal. The air conditioner sits on a gasket on the roof. Over time, this seal can degrade, allowing water ingress. Inspect annually and reseal if necessary.

Run it periodically. If the van is stored for extended periods, run the air con for 15 to 20 minutes monthly to keep the compressor lubricated and seals flexible.