Ventilation & Cooling
Overview
Overview
Ventilation & Cooling Overview
About Ventilation & Cooling
About Ventilation & Cooling
A fan does not cool anything. It moves air. A vent swaps it. An air conditioner is the only thing here that actually lowers the temperature, and knowing which of those three jobs you need is most of the decision.
Moving air is what a cabin fan does, and on a humid night it is often enough. Air across skin feels cooler even when the thermometer has not changed, which is why a small 12V fan by the bed turns a night you would have got up from into one you sleep through. It draws almost nothing, so it runs all night without the battery noticing.
Swapping air is what a roof vent does. Cooking, showering and breathing all put moisture into a closed space, and moisture is what makes a van feel stuffy and a caravan grow mould. A roof vent with a fan pulls the damp air out through the top, where it collects, and lets dry air in. Rain sensing versions close themselves when the weather turns so nobody has to sprint for the hatch.
Lowering the temperature is what an air conditioner does, and it is the only option that works when the air outside is as hot as the air inside. It is also the one that draws the most by a wide margin. Check what it needs against what the setup can supply before assuming it runs off the battery, because for most rooftop units the honest answer is a powered site or a serious inverter.
Work out which job you actually need before you shop, because the price gap between the three is wide and the wrong one does not do the other one's job.




