How to Install Air Conditioning in Your Caravan

Jul 12, 2025

Sweating in your caravan like it’s a mobile sauna? The short answer: Yes, you can install air conditioning—and it’s easier than you think. This playful guide breaks down Caravan and Motorhome Air Conditioning installation step-by-step, with tips, laughs, and zero meltdown moments. Keep reading—your comfort depends on it.

Before You Begin: Planning and Preparation

Choosing the Right Location for Your Air Conditioner

Caravans typically use two kinds of air conditioning systems: rooftop units and split systems. Rooftop models are compact and easy to install. They sit neatly on the roof, saving interior space.

Split systems involve a separate indoor and outdoor unit. They offer more placement flexibility but can require additional modifications. Whichever you choose, make sure the location allows for good airflow and minimal disruption.

Assessing Your Caravan's Structural Support

Before cutting any openings, confirm that the roof can handle the weight of a rooftop unit. You’ll also want to avoid areas where structural beams run across.

A poorly supported install can lead to sagging, water leaks, or long-term roof damage. Check your caravan manual or consult a professional if unsure.

Understanding the Electrical Requirements

Different units draw different amounts of power. Many compact systems run on 12V DC, while larger ones use 240V AC.

Make sure your caravan’s battery and alternator setup can handle the load. If not, you may need to upgrade or consider running off mains hook-up when parked.

EcoFlow portable air conditioner unit with digital control panel and modern compact design, on a white background.

Tools and Materials You Will Need

Get all your tools and components ready before starting. You’ll need:

A drill with assorted bits
A jigsaw or reciprocating saw
Sealants and adhesives
Electrical wiring, fuses, and connectors
The air conditioning unit and its interior assembly

Preparing in advance helps avoid delays and halfway surprises.

The Installation Process: A Step-by-Step Walkthrough

Step 1: Creating and Sealing the Roof Opening

This is a critical step. Mark out the area based on the manufacturer’s measurements, double-checking against the internal layout.

Use a jigsaw or reciprocating saw to make the cut. Take your time. Once done, apply sealant around the edges immediately to prevent any water ingress.

Step 2: Mounting the External (Rooftop) Unit

Lift the external unit into place and align it with the roof opening. It should sit snugly without gaps.

Use the fixings provided to bolt it down, and apply additional sealant around the base. A secure fit helps prevent rattling and weather damage.

Step 3: Fitting the Internal Ceiling Assembly

The internal components include the control panel and air vents. These should be aligned directly beneath the rooftop unit.

Secure them with the mounting hardware provided. Place them in a position where air will circulate evenly throughout the caravan.

Step 4: Connecting the 12V and 240V Wiring

Follow the wiring instructions included with your air conditioner. Use the correct gauge of wire and secure all connections with clips or terminals.

Test the unit before finalising the internal panel to make sure everything powers on correctly. Always double-check grounding and fuse protection.

ruma Aventa Comfort air conditioning unit shown on white background, highlighting its underside air vents

DIY vs. Professional Installation: What's Best for You?

The Pros and Cons of a DIY Approach

Pros:

Cost-effective if you're handy
Satisfying to complete the job yourself

Cons:

Mistakes can void warranties
Electrical errors may be dangerous
Time-consuming for first-timers

DIY is doable for confident caravan owners, but know your limits.

How to Find and Choose a Qualified Installer

Ask around in caravan forums or groups for recommendations. Look for professionals with experience in motorhome or caravan-specific systems.

Check reviews, ask for proof of certification, and make sure they’re familiar with your unit model.

Average Costs for Professional Installation

Installation costs vary by region and unit type. On average, expect to pay between £400 and £800.

Complex installations or premium models may cost more, but you’re paying for peace of mind and guaranteed safety.

Truma roof-mounted air conditioner on a campervan, with a smiling couple enjoying a sunset in the foreground.

Finalising Your Installation

Post-Installation Checks and Testing

How to Perform a Leak Test

Spray around the roof seal with water or wait for a rainy day. Check the interior ceiling for signs of moisture.

Even small leaks should be resealed immediately to prevent long-term damage or mould.

Testing the Unit's Functions and Airflow

Power on the unit and let it run through all settings—cool, fan, and auto. Check that the air flows evenly from all vents.

Test the temperature controls and remote if one is provided. The unit should respond smoothly and quickly to input.

Essential First-Time Use and Maintenance Tips

Let the system run gently for its first few cycles. Avoid setting it to max power immediately after installation.

Clean the filters monthly, especially in dusty locations. Check the seals annually and inspect wiring connections if you notice any odd smells or drops in performance.

Keeping your air conditioner well maintained will ensure years of reliable cooling on the road.

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