Whether you’re basking in summer sun or setting off for a crisp winter escape, your caravan combi air conditioner is designed to keep you comfortable through every season. But to truly get the best out of it, a little seasonal know-how goes a long way.
Modern dual-use systems, like the Truma Aventa Comfort and Mestic RTA range, are built to both cool and heat efficiently — yet how you use and maintain them can make all the difference in performance, energy use and lifespan.
Here’s how to keep your combi air conditioner running smoothly and feeling fresh all year long.
☀️ In Summer: Maximise Cooling Efficiency
When temperatures rise, your air conditioner becomes your best friend. To keep it working efficiently:
1. Pre-Cool Before Peak Heat
Switch it on early in the morning before your caravan warms up. It’s easier for the unit to maintain a cool environment than to fight against built-up heat.
2. Close Windows, Blinds and Roof Vents
It sounds simple, but blocking direct sunlight makes a huge difference to your air conditioner’s workload. Reflective window shades or insulated blinds help maintain cooler air.
3. Maintain Good Airflow
Avoid placing large items near the vents. Your system circulates air through internal ducts, so unobstructed flow ensures even cooling throughout the caravan.
4. Keep Filters Clean
Dust and pollen build up quickly in summer. Clean or replace filters monthly to prevent reduced efficiency and airflow.
5. Use Eco or Fan Mode at Night
Once the temperature drops, switch to a lower fan setting or energy-saving mode for quieter, economical overnight comfort.
❄️ In Winter: Stay Warm, Dry and Efficient
Reverse-cycle air conditioners shine in the colder months — but a few smart tweaks make them even better.
1. Pre-Warm Before You Settle In
Just like in summer, start your system early. Turning on the heating function while you prepare dinner or get ready for bed gives it time to balance the temperature evenly.
2. Keep Heat In
Close windows, use draft stoppers and fit insulated blinds or thermal mats to reduce heat loss. Even a small draft can make your air conditioner work much harder.
3. Dry the Air, Don’t Damp It
Unlike gas heaters, combi air conditioners don’t add moisture, which helps prevent condensation. Use the dehumidify setting during damp conditions to keep bedding and walls dry.
4. Maintain a Moderate Temperature
Setting the thermostat to around 20–22 °C keeps you warm without overworking the system. It’s more energy-efficient than pushing for maximum heat.
5. Check Roof Seals and Air Outlets
After months of cold and wet weather, inspect external seals and air vents for debris or frost buildup — a quick check keeps airflow strong.
🧰 Maintenance Checklist for Every Season
| Task |
Frequency |
Why It Matters |
| Clean or replace filters |
Monthly in use |
Keeps airflow clear and efficiency high |
| Check vents and grills |
Before each trip |
Prevents overheating and uneven cooling |
| Run in opposite mode briefly (cool in winter / heat in summer) |
Every 1–2 months |
Lubricates compressor and maintains system health |
| Inspect roof seals and fixings |
Seasonally |
Prevents leaks and heat loss |
| Clean exterior housing |
Seasonally |
Removes dust, pollen and grime |
| Test remote controls and thermostats |
Before each trip |
Ensures reliable temperature control |
Regular maintenance not only improves comfort but also extends the lifespan of your unit — saving you money on repairs or replacements down the line.
🌡 Tips to Get the Most Out of Your Combi System
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Use Auto Mode Smartly: Many modern systems automatically switch between heating and cooling to maintain your set temperature. Perfect for unpredictable UK weather.
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Set Gradual Temperature Changes: Avoid setting the thermostat too high or low all at once — gradual adjustments keep energy use balanced.
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Keep Doors Closed: Caravan interiors are compact; even briefly open doors can let out a lot of conditioned air.
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Pair with Smart Power Use: If you’re off-grid, consider a compatible inverter or generator to ensure steady power supply for your system.
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Use Your Air Con Year-Round: Running your system regularly prevents internal parts from seizing up, particularly during long storage periods.
💬 Frequently Asked Questions
Can I use my air conditioner below freezing?
Most systems, including Truma Aventa and Mestic RTA models, will operate down to around 4 °C. For temperatures below that, supplement with an electric heater or use the air conditioner’s dehumidify mode.
Should I run my air conditioner during storage?
Yes — running it for a few minutes every month helps maintain compressor oil circulation and prevents component stiffness.
Why does my system make more noise in heating mode?
You may hear brief gurgling or compressor sounds as it changes cycle — completely normal in reverse-cycle operation.
Can I clean the filters myself?
Absolutely. Most models have easy-access front panels. Gently vacuum or wash the filters with warm water and let them dry before reinstalling.
☀️❄️ The All-Season Advantage
Your combi air conditioner is one of the most valuable upgrades in your caravan. By learning to adjust settings, maintain filters and make small seasonal changes, you’ll enjoy comfortable temperatures, reduced condensation, and better energy efficiency — no matter the weather outside.
