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Evaporative Cooling: How much cooling can be expected?

You can get an idea of how much cooling can be expected in a particular environment by taking a look at the below graph which shows the temperature of the air blowing out of the Fresair unit versus the outside air temperature, in various relative humidities. Even in higher humidities a lot of comfort and temperature reduction is realized versus a regular fan. At >80% relative humidity though the air temperature drop is minimal, however directional airflow from the vents works better than a single fan. For those in VanLife, the graph also shows the human comfort of trying to sleep on a hot and humid night whilst only using Fresair. If you are going to sleep in a vehicle in very hot and very humid environments you will need to use traditional, compressor-based AC units, either by running the vehicle’s AC or installing a regular AC. Fresair is an advanced evaporative AC unit but high humidity still reduces its effectiveness. It’s a balance between using high-power and noisy compressors vs a quiet 12v/water system. Fresair can handle the majority of cooling situations but it has its limitations when humidity is very high. Installing Fresair will keep you cool, with low power and low noise, in the majority of environments. If you plan on traveling to tropical areas, Fresair will help reduce the load on your traditional AC units but it cannot safely reduce the temperature in extreme climates. If you plan on using Fresair as your only AC system you need to be aware of the temperature and humidity of wherever you’re traveling. If you’re pushing into the “orange zone” at night then you would need to run the vehicle AC, a separate coolant-based AC unit… or check into a hotel!


Fresair S7i Air Conditioner Cooling Chart

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