Internal Caravan Temperature vs External Heat: Do Dark Caravans Really Get Hotter?
If you’ve ever stood in a dealership yard on a warm Adelaide afternoon, you’ve probably wondered the same thing we did: does a dark caravan get hotter inside than a white one? More specifically, does the outside colour actually change the caravan temperature enough to matter when you’re travelling in summer?
This week on Adventure Ready, we put that myth to the test in true Mythbusters style – thermometers, identical vans, and an Australian sun doing what it does best.
The Test Setup: Keeping the Caravan Temperature Comparison Fair
To get the most accurate results possible, we set up a controlled comparison between two identical caravans:
Model: Leader Gold 21T6 bunk caravans
Same layout, same size, same height
Parked on the same side of the yard
Same sun exposure all day
Blinds closed to reduce heat gain through the windows
Thermometers placed inside both caravans at 7:45am
Temperature readings recorded every 30 minutes from 8:00am to 3:00pm
The only major difference?
✅ One caravan had a dark composite panel
✅ The other was a white aluminium ribbed cladded caravan
In other words, we did everything we could to make this a genuine test of colour and cladding type versus internal caravan temperature.
External Temperatures: The Caravan Skin Gets HOT
At 3:00pm, on a day officially hitting 30°C (our thermometer reading closer to 31–32°C), we measured surface temperatures on different panels. Here’s what we found, measuring roughly 2 inches off the surface in direct sun:
Dark Composite Panel – 48.7°C
White Composite Panel – 43.2°C
White Aluminium Ribbed Cladding – 46.7°C
Interesting result here: the aluminium ribbed cladding was around 3°C hotter than the flat composite panel section on the same van.
Dark Aluminium Ribbed Cladding – 57.8°C
That’s nearly 10°C hotter than the flat composite panel surface we tested earlier.
So yes – externally, the van’s surface can vary a lot depending on cladding type and colour. On the outside, the caravan temperature (surface level) absolutely changes.
Internal Caravan Temperature Results: The Surprise Everyone Was Waiting For
After seeing those surface temps, we expected the dark van to turn into a sauna. That’s what most people assume, right? But when we stepped inside the white van at the peak of the day, during filming, the internal sensor showed:
Outside: 31.7°C
Inside: 37.9°C
That’s about a 6-7°C increase above the outside air temperature. Warm? Yes. Unlivable? Not necessarily. But here’s where it gets interesting – at 3pm the final internal readings of the dark composite van and the white aluminium van finished at:
✅ 36.5°C inside
That wasn’t “close enough.” That was identical. Despite one caravan being dark and the other being white, the internal caravan temperature ended up exactly the same.
Caravan Temperature in the Morning: How the Day Started
To make sure the results weren’t a fluke at the end, we looked back at the first measurement of the day. At 8:00am, the temperatures were:
Outside: 18.3°C
Dark van inside: 20.4°C
Light van inside: 21.5°C
So the light van actually started slightly warmer, and throughout the day the two vans climbed very consistently together, which means this wasn’t just a “lucky moment” at 3pm. The overall trend showed both caravans tracking closely all day.
Why Colour Didn’t Change the Internal Caravan Temperature (Much)
This test helped us separate perception from reality, because what we thought would happen is – Dark van absorbs more heat → internal caravan temperature goes way higher. What actually happened was the dark composite panel absorbed heat on the surface, but the internal temperature stayed the same as the white van.
A big reason is likely the construction materials themselves. Composite panels behave differently to ribbed aluminium. Even with darker colour absorbing heat, the composite panel may reduce the heat transfer into the van better than expected (compared to traditional cladding).
In short: outside temperature changes fast, inside temperature changes slower – and that’s why insulation and build type matter so much.
The Real Secret to Comfortable Caravan Temperature: Appliances & Power
The biggest takeaway from our Mythbusters day wasn’t “dark vans are fine”… it was that your comfort is mostly controlled by what’s inside the caravan. Things like:
Sirocco fans
Reverse cycle air conditioning
High-quality inverter air conditioners
Diesel or gas heaters in winter
Battery + inverter setups for off-grid cooling
Because the reality is, Australian conditions don’t muck around. When you’re in places like Renmark and it’s 42°C, shade and colour alone won’t save you. Having the ability to run cooling consistently matters more than shaving a couple of degrees off with insulation. A solid power setup means if the caravan park power drops out (which happens more than people realise), you can still keep the internal caravan temperature comfortable – without sweating it out.
What This Means If You’re Choosing a Caravan Colour
If you’re torn between a dark van and a white van, here’s the practical answer: Pick the colour you love.
Because based on this test, it made very little difference to the internal caravan temperature when comparing dark composite vs white cladded. What will make a difference is ventilation, insulation type, airflow, cooling appliances, and power capability to run them consistently.
Next Tests Coming: Caravan Temperature Comparisons We’re Excited About
This experiment raised even more questions and we’re keen to keep going. Next up, we’ll be running more caravan temperature tests comparing things like:
- White composite panel vs dark composite panel
- Sandwich panel builds vs timber frame construction
- Different wall/roof materials and insulation types
- Plus more real-world tests in harsher SA summer conditions
So if you want to see what actually keeps a caravan cool (not just what people assume), make sure you stay tuned – because we’ll keep testing it properly, with numbers you can trust.
