Complete Guide To Caravan Air Conditioners

Stay Cool on the Road with the Right Caravan Air Conditioner

Whether you're navigating the red dust of the Outback or chasing sea breezes along Australia’s sun-drenched coastline, one thing is for sure, a reliable caravan air conditioner is essential for travelling in comfort across this vast and weather-diverse country. Our beautiful country is no joke when it comes to scorching summers! In the land of extremes, where summer temperatures can soar well beyond 40°C and humidity can turn even a short stopover into a sweaty ordeal, your caravan cooling system isn’t a luxury, it’s a necessity.

Australia’s climate is famously unpredictable and viable. From the arid heat of inland deserts to the sticky humidity of tropical Queensland and the chilly evenings of southern highlands, every region presents its own environmental challenges. For many RV owners, staying cool and comfortable while on the move means navigating not only the weather but also power constraints, especially for those embracing off-grid caravan air conditioning in remote locations. Add to this the complexity of caravan air conditioner installation and choosing a model suited to both your vehicle size and travel style, and it’s easy to see why picking the best caravan air conditioner can feel overwhelming, rightly so. But don’t worry, we’ve got you covered.

This guide is designed to demystify the process. Whether you're brand new to vanlife or looking to upgrade, we’ll walk you through everything you need to know, from the different types of caravan air conditioners available, to the key factors to consider before buying. You’ll get a comprehensive brand and model comparison, learn about power solutions for on-grid and off-grid setups, and get expert advice on installation, maintenance, and troubleshooting common issues.

We’ll also cover regional considerations for Australian travel, offer clear buyer’s recommendations, and look ahead to emerging trends and innovations shaping the future of RV air conditioner Australia. Finally, our FAQs will address the most common questions from caravaners just like you.

So, let’s get started—because a cooler caravan means a better adventure.

Types of Caravan Air Conditioners 

Rooftop Air Conditioners

When choosing a caravan air conditioner, rooftop units are often the go to option for many Australian travellers. These systems are mounted directly on the roof of your caravan or RV, making the most of external space while delivering powerful, efficient cooling. Rooftop air conditioners are a practical solution for a range of caravan types and travel needs, and they’re particularly well-suited to Australia’s demanding climate conditions.

 

How Rooftop Air Conditioners Work

Rooftop air conditioners operate by drawing in air from outside, cooling it through a refrigerant system, and distributing it inside the caravan via ceiling-mounted vents. Most units feature multi-directional airflow and fan speed settings, allowing for effective temperature control and even cooling throughout your living space. Because cool air naturally sinks, this top-down airflow method is especially efficient—quickly cooling the entire van from top to bottom.

These systems are commonly reverse-cycle, meaning they offer both cooling in summer and heating in cooler months, making them a versatile solution for year-round travellers.

Pros

• Space-Saving Design: Because the unit is installed externally, you preserve precious internal space—leaving more room for cupboards, benchtops, and storage. This is a major advantage, especially in smaller vans where every bit of space counts.
   
• Efficient Cooling: Thanks to the natural behaviour of cool air sinking, rooftop systems can cool your caravan faster and more evenly compared to other types of air conditioners.
   
• Central Placement: These units are typically installed in a central roof location, which allows for optimal air distribution throughout the cabin.
   
• High Compatibility: Suitable for most caravans and RVs with a structurally sound roof, rooftop air conditioners are a solid fit for a wide range of vehicle layouts and sizes.
   

Cons

• Weight Limitations: While these units are designed for durability, not all caravan roofs—especially those on pop-tops or smaller campervans—are built to support their weight. Roof modifications and additional structural supports may be required, which can significantly increase the installation cost.
   
• Height Restrictions: Adding a rooftop unit increases your vehicle’s total height. This can create issues when navigating areas with low-clearance obstacles such as car parks, tunnels, or tree-lined campsites.
   
• Complex Installation: Installing a rooftop RV air conditioner Australia model typically involves cutting into the roof, wiring, and sealing, tasks that are best handled by a professional. DIY installation may void your warranty or lead to leaks if done incorrectly.
   

Ideal Applications and Scenarios

Rooftop air conditioners are best suited for full-size caravans and RVs with sufficient roof strength. They’re ideal for those travelling through hotter Australian regions—such as the Northern Territory or inland Queensland—where a high-capacity caravan cooling system is essential for comfort and safety.

If you’re planning extended trips or living on the road full-time, rooftop units provide the most effective climate control. For those travelling off-grid, these units can be integrated into off-grid caravan air conditioning setups, provided your power system (batteries, inverter, and solar) is properly sized to handle their higher energy demands.

Top brands like Dometic and MyCOOLMAN  offer rooftop models specifically engineered for tough Australian conditions, making them a reliable and long-term investment in comfort and performance.

Under-Bunk Air Conditioners

When rooftop installation isn’t an option—particularly in pop-top caravans, camper trailers, or compact RVs—under-bunk air conditioners provide a smart, space-conscious cooling solution. These units are installed inside the van, typically beneath a bed or bench to not take up too much space, and use ducting to distribute air throughout the interior. Designed to cool smaller spaces efficiently, they’re ideal for caravans where roof strength or height restrictions rule out a rooftop model.

 

How Under-Bunk Systems Work

An under-bunk air conditioner draws in external air via a floor-mounted cut-out and expels heat through a similar outlet. Cool air is then circulated through a ducted system to different zones in the van. These units are generally compact and lightweight, making them especially suited to smaller caravans or RVs that can't structurally support a rooftop system.

This approach also helps maintain a lower overall caravan roof height, a real benefit for storing the vehicle in garages or accessing height-restricted areas. The positioning inside the caravan also means the system is less exposed to environmental wear and tear.

Pros

• Ideal for Pop-Tops and Small Vans: Most pop-top caravans, without modification, aren’t built to carry the weight of a rooftop RV air conditioner. Under-bunk systems provide a practical alternative without the need for costly roof reinforcements.
   
• Saves Roof Space: Keeps the roof free for solar panels, roof racks, or skylights—ideal for travellers looking to maximise external functionality.
   
• Lightweight and Efficient: These systems are generally more compact and energy-efficient, making them suitable for both on-grid and off-grid caravan air conditioning setups.
   
• Lower Centre of Gravity: Keeping weight low in the vehicle helps improve handling and stability when towing.
   

Cons

• Uses Interior Space: Unlike rooftop models, under-bunk systems occupy space inside your van, usually in an under-bed or under-seat compartment. This may reduce your available storage or cupboard space, especially in already compact layouts.
   
• Ducting Required: Proper airflow often relies on multi-duct setups, which can increase the installation complexity and cost compared to a single-unit design.
• Not ideal for 4wd campers and caravans that enter water crossings due to the air inlet and outlets on the floor of the caravan being exposed.
   

Best Scenarios for Use

If you own a pop-top, camper trailer, or compact caravan, and a roof-mounted system isn’t suitable, an under-bunk air conditioner may be the most logical—and cost-effective—choice. They offer efficient climate control without increasing your van’s height, making them a preferred option for travellers who store their caravan in height-restricted garages or want to avoid major structural modifications. For those after a low-profile, caravan cooling system that still delivers on performance, under-bunk units are a strong contender. 

 

Key Selection Factors

Caravan Size and Air Conditioner Capacity

One of the most critical factors in choosing the best caravan air conditioner is ensuring it's correctly sized to suit your van. Selecting a unit with the right cooling capacity means your system will run efficiently, maintain comfort, and avoid unnecessary strain, especially during the height of the Australian summer.

What Size Air Conditioner Do I Need?

In the caravan and RV industry, general sizing guidelines are as follows:

• 2.0 to 2.5 kW units are typically suitable for caravans up to 16 feet in length.
   
• 3.0 kW or higher models are ideal for caravans up to 24 feet.
   
• Larger motorhomes or fifth wheelers may require dual air conditioners, especially if the layout includes separate living and sleeping zones.

Here’s a helpful breakdown:

 

 

Understanding Capacity vs Power

It’s important to distinguish between capacity and power when evaluating an air conditioner. They are not the same thing and confusing the two can lead to buying a unit that either underperforms or draws more power than your system can handle.

• Capacity refers to how much heating or cooling an air conditioner can provide in a given time, usually measured in kilowatts (kW) or BTUs (British Thermal Units). For example, a 3 kW air conditioner is capable of removing 3 kW worth of heat per hour from the caravan interior.
  
  Note: Manufacturer performance specifications are typically based on well-insulated, fixed-roof caravans or RVs. If your van has a pop-top or canvas sections, you may need a higher-capacity unit to compensate for reduced thermal efficiency.
   
• Power, on the other hand, refers to the electricity required to operate the system. This is often displayed in volts and amps, and sometimes also in kW. However, the input power draw is not always proportional to the cooling or heating capacity. Some models achieve greater efficiency through advanced compressor technology and lower current draw, which is especially important if you're running off-grid caravan air conditioning systems or relying on a generator.
   

Insulation and Layout Considerations

A van’s insulation quality directly affects how well any RV air conditioner in Australia will perform. Poor insulation allows cool air to escape more quickly and lets heat in faster, making your air conditioner work much harder.

To compensate for this:

• Choose a slightly more powerful unit if your caravan has thin walls, canvas sections, or single-glazed windows.
   
• Consider insulating accessories such as thermal curtains, vent covers, and window film for improved energy efficiency.

 

 

The layout also matters. A single open-plan area is easier to cool than a caravan segmented into small, enclosed rooms. In more complex layouts, ducted systems or models with adjustable airflow direction are preferable to achieve even cooling.

Special Cases: Pop-Tops and Camper Trailers

If you own a pop-top, camper trailer, or expandable caravan, standard rooftop air conditioners may not be an option due to structural limitations. These vans often feature lightweight or collapsible roofs that aren’t designed to support heavy roof mounted units.

In these situations:

• Under-bunk air conditioners are a practical alternative, offering sufficient cooling capacity with a much lower weight profile.
   
• Always confirm the roof’s weight-bearing capability if considering a rooftop unit reinforcement can be costly and complex.
   
• Expect to oversize slightly if your van has poor insulation or lots of canvas, as these materials allow heat in (and cool air out) more easily.

 

 

Don't Forget the Heat

While cooling capacity is the main priority in summer, don’t forget that many caravan air conditioners also include reverse cycle heating, making them a year round solution. Just as with cooling, heating performance depends on the size of your van and its insulation quality. A unit that’s too small will struggle to maintain warmth in cold conditions, especially in larger or poorly insulated caravans.

Summary: Getting the Size Right

Choosing the right size caravan air conditioner is one of the most important decisions you’ll make when fitting out your RV. It's not just about choosing the highest output unit available (and highest energy consuming), it’s about selecting a system that balances performance, energy efficiency, and compatibility with your van’s design.

In short:

• Match your unit’s kW rating to the size and layout of your caravan.
   
• Consider insulation and layout as equally important as size.
   
• Pay special attention to weight and roof load when dealing with pop-tops or campers.
   
• Always check manufacturer guidelines and performance specifications, especially if you’ll be travelling in areas with extreme temperatures or relying on off-grid caravan air conditioning.

Weight and Dimensions

When selecting the best caravan air conditioner for your setup, weight and size are not just technical specifications, they’re critical factors that impact your caravan’s safety, stability, and legal compliance. Australian caravanners must be especially mindful of payload limits and road regulations, particularly when travelling off-grid or through remote regions with variable terrain and infrastructure.

How Air Conditioner Weight Affects Payload and Stability

Every caravan has a Maximum Payload Capacity, which is the maximum allowable weight you can carry on top of the base Tare (unladen) weight. Installing a heavy caravan air conditioner, especially a rooftop model directly influences this payload. While individual units may not seem significant at 30–50 kg, that weight is high up on the structure, which can raise the centre of gravity and impact handling and towing stability.

This becomes even more crucial if you carry additional rooftop gear such as solar panels, satellite dishes, or roof racks. The cumulative load can exceed the roof’s structural limits or compromise on road balance. Always consult your caravan’s manufacturer or compliance plate to confirm allowable rooftop weight and total payload.

For off-grid caravan air conditioning, keeping weight to a minimum is even more essential. Remote travel demands a careful balance of power systems, water tanks, spare tyres, and food supplies. Lighter air conditioning units like under-bunk models or low-profile rooftop systems can help maintain this balance without sacrificing comfort.

Roof Load Limitations and Structural Considerations

Not all caravan roofs are designed equally. Pop-tops, camper trailers, and hybrid models often feature thinner materials or collapsible roofs that aren’t engineered to carry heavy rooftop loads. In these cases, retrofitting a standard RV air conditioner Australia model may require roof reinforcement, an expensive and invasive process.

 

Key considerations include:

• Rib spacing and roof bracing: Vintage or lightweight vans may need additional framing.
   
• Lift mechanisms: Pop-top struts may need upgrading to support added weight.
   
• Warranty implications: Modifying the roof structure may void the caravan manufacturer’s warranty, ensure you’re aware of your warranty T&Cs before making any serious modifications.
   

If rooftop installation is not viable, under-bunk air conditioners offer a more structurally compatible solution, though, at the cost of some internal storage space.

Dimensional Considerations for Clearance and Aerodynamics

Beyond weight, the physical size of your air conditioner can affect how your caravan performs on the road. Rooftop units—particularly older or higher-profile models—can introduce wind resistance that affects towing performance and fuel efficiency. While not always a deal-breaker, it’s something to consider if you regularly travel long distances or through areas with strong headwinds.

Taller units may also increase your caravan’s overall height, which can restrict access to:

• Low-clearance bridges or tunnels
   
• Urban parking structures
   
• Tree-covered campsites
   
• Domestic carports or garage storage
   

Importance of Low-Profile Designs

To counter these issues, many modern manufacturers offer low-profile caravan air conditioners specifically designed for aerodynamic performance and minimal height increase. These units sit closer to the roofline, reducing drag and helping you stay under common clearance limits (often around 3.1 to 3.3 metres for full height caravans).

Low profile models are particularly beneficial for:

• Pop-top caravans, where roof clearance is already limited.
   
• Fuel efficiency, especially when towing with mid-sized vehicles.
   
• Urban travellers, who need to navigate tight city infrastructure or store their van at home.

 

Power Requirements

Power consumption is one of the most important practical considerations when choosing a caravan air conditioner, especially if you plan to travel off-grid or rely on alternative power sources. Misunderstanding how power is drawn and used can lead to performance issues, system overloads, or the need for costly upgrades to your energy setup. This section will walk you through the key power considerations for selecting the right RV air conditioner in Australia.

Understanding Power Consumption Figures

Air conditioners are often evaluated based on their cooling capacity (in kilowatts or BTUs), but that doesn’t tell the whole story. What truly impacts your caravan’s power system is the electrical power draw—how much energy the unit consumes to deliver that cooling or heating.

This is typically represented by:

• Amps (A): How much current the unit draws.
   
• Watts (W): Overall power usage, calculated as Volts × Amps.
   
• Startup (or peak) wattage vs. running wattage.

 

A common misunderstanding is assuming that if an air conditioner is rated at 3 kW of cooling capacity, it also draws 3 kW of power to run,  This is not the case however.. Many efficient models can deliver 3 kW of cooling while drawing far less electricity, thanks to modern compressor and fan technologies. That’s why it’s crucial to compare capacity against power draw when evaluating performance and efficiency.

Starting vs. Running Wattage Requirements

One of the more technical but critical elements is the distinction between starting wattage and running wattage.

• Starting wattage refers to the brief surge in electricity required to get the compressor motor going, often 2–3 times higher than the normal running wattage.
   
• Running wattage is what the unit draws continuously during operation.
   

For example, a rooftop unit may only require 1,200 watts to run but spike to 2,800–3,000 watts on startup. This matters a lot if you're using a portable generator, battery inverter system, or off-grid solar setup, these systems must be rated to handle that initial surge, or the air conditioner simply won’t start.

To address this, many newer caravan air conditioners feature soft start or inverter technology, which greatly reduces startup loads.

Compatibility with Different Power Sources

Whether you’re running your caravan air conditioner on mains power, generator, or a 12V battery to inverter setup, compatibility and efficiency are key.

1. Mains Power (240V AC): No compatibility issues, but you’ll still want a unit that doesn’t draw excessive amps, especially at busy campgrounds with shared supply limits.
    
2. Generators: The most important thing is ensuring the generator’s output meets or exceeds the starting wattage of your unit. Many caravaners opt for 2.4 kVA or larger inverter generators to comfortably handle startup loads. Look for inverter-friendly models or units with soft-start features to reduce generator strain.
    
3. Off-Grid and Battery Systems: Running an air conditioner entirely off batteries is possible but requires a well-designed system. You’ll need:
    
   • A high output inverter (typically 2,000W or higher continuous rating)
      
   • Deep-cycle lithium batteries with high discharge rates
      
   • Solar input for recharging (preferably 400W+ solar array)
      
   • Energy-efficient A/C models with low draw and soft-start tech

 

When designing an off-grid caravan air conditioning setup, consider seeking professional advice to balance cooling comfort with energy efficiency and safety.

Inverter Technology and Its Benefits

Inverter technology has become a game-changer in both residential and RV air conditioning. Traditional air conditioners cycle on and off at full power, while inverter-driven systems adjust compressor speed in real-time to maintain a consistent temperature.

Benefits of inverter air conditioners include:

• Lower power draw: Especially useful for solar, battery, or generator-powered setups.
   
• Reduced startup surge: Minimises stress on power systems and allows operation from smaller generators.
   
• Quieter performance: Continuous operation at low speeds eliminates harsh cycling noise.
   

Longer system lifespan: Reduced wear-and-tear from soft start-up and variable speed operation.

 

While inverter equipped models may have a slightly higher upfront cost, their improved energy efficiency and versatility make them a worthwhile investment, particularly if you plan to travel frequently or camp without mains power.

Final Recommendations

Choosing the right caravan air conditioner comes down to understanding your setup, travel style, and budget. Throughout this guide, we’ve covered the major types of air conditioners—rooftop, under-bunk, and portable—along with key considerations like cooling capacity, energy efficiency, and off-grid capability.

To recap:

• Pop-tops and camper trailers benefit from lightweight rooftop units like the Dometic FreshJet Lite, or space-saving under-bunk options.
   
• Full-height caravans are best matched with inverter-friendly, high-efficiency models like the FreshJet Pro or MyCoolman—perfect for solar and generator use.
   
• Motorhomes, with larger interiors, need high-capacity systems such as the Dometic FreshJet Plus to maintain comfort throughout.
   

Recommended Brands & Models 

 

When deciding, weigh up your typical travel locations (hot and humid vs. cool and dry), your off-grid setup (solar/battery/inverter size), and how much interior space you're willing to sacrifice. If you travel mostly in holiday parks, you may prioritise comfort and ease of use. If you're a free camper or off-grid adventurer, power efficiency and soft start technology will be more important.

Final advice: Don’t just buy based on brand or BTU. Consider the long-term practicality for your lifestyle and rig.

 

Installation and Setup

DIY vs Professional Installation

• DIY: Possible with technical knowledge, especially for under-bunk units. Always follow manufacturer instructions.
   
• Professional Install: Recommended for rooftop units due to electrical wiring, sealing, and roof reinforcement needs.
   
• Legal & Warranty Considerations: Improper installation can void warranties and insurance. Use certified RV technicians.

Installation Tips

• Use existing 360x360mm or 400x400mm roof openings where possible.
   
• Reinforce pop-top roofs if weight exceeds manufacturer roof specs.
• Thoroughly seal all new installations, remember water will always win.
   
• Ensure clean, sealed ducting routes for under-bunk units.
   
• Always isolate power during install and follow AS/NZS 3000 electrical standards.
   

Maintenance and Care

Routine Maintenance

• Clean Filters: Every 2–4 weeks in use
   
• Inspect Condenser Coils: Every 6–12 months; clear dust and debris
   
• Ducts & Vents: Check for obstructions and vacuum annually
   
• Pre/Post Season Checks: Test cooling and heating before major trips or after storage
• Storage Checks: Always check for rodent and insects nest if storing for long periods

 

 

Extending Lifespan

• Use UV covers and store units properly in off-season
   
• Avoid operating in extreme ambient temperatures unless rated for it
   
• Maintain airflow and clean internal parts regularly
   
• Follow all manufacturer maintenance recommendations
   

Troubleshooting Common Issues

 

Still unsure? Explore our detailed product pages, comparison tools, and expert support at Caravan RV Camping—Australia’s largest store for caravan comfort gear. Get the perfect air conditioner and travel in comfort, wherever the road takes you.

 

What size generator do I need to run my caravan air conditioner?

A generator is required to power your caravan air conditioner if you intend to camp off-grid – meaning there is no power available! We recommend a good quality 2400W inverter generator in most cases. The latest caravan air conditioners by Dometic are manufactured using inverter technology and can be started and run with a good quality 2000W inverter generator. See our table below for the three Dometic caravan air conditioners currently on the market and the best generator models available to run them.

 

Best Generator Models Available:
Air Conditioner Model:	Under $1,100:	Under $1,300:	Under $2,500:
Dometic FreshJet Lite Air Conditioner	Cromtech Outback 2400W Inverter Generator	MaxWatt 2500W Petrol Inverter Generator	Yamaha 2200W Inverter Generator
Dometic FresJet Plus Air Conditioner	Cromtech Outback 2400W Inverter Generator	MaxWatt 2500W Petrol Inverter Generator	Yamaha 2200W Inverter Generator
Dometic FreshJet Pro Air Conditioner	Cromtech Outback 2400W Inverter Generator	MaxWatt 2500W Petrol Inverter Generator	Yamaha 2200W Inverter Generator

 

 

 

DISCLAIMER* Please note, this advice is general in nature and we strongly recommend consulting the product manual and where relevant, a professional installer.

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