This free tool estimates the annual condensation risk inside a sealed enclosure (IP54 to IP68) and the AirSponge desiccant area needed to reduce it, using 82 hourly European climates and a physical model calibrated on field measurements. Quick dew point calculator ↓
Estimate the AirSponge area needed to reduce the risk of condensation in your enclosure, based on your climate and its sealing.
The dew point is the temperature at which air reaches saturation (100% relative humidity): any surface colder than this point collects condensation. Enter the air temperature and relative humidity to get it (Magnus formula).
Dew point: 14.4 °C — any wall at or below this temperature will condense.
The simulator solves, hour by hour over a full climate year, a physical model of four coupled equations: water vapour, liquid water deposited on the wall, internal air temperature, and water adsorbed by the AirSponge material (isotherms with hysteresis). The wall is treated as the worst case: colder than the internal air, as it is outdoors at night. The model is calibrated on field measurements from instrumented EV charging stations — where two AirSponge strips divided the time spent above 95% RH by 2.6 over 85 winter days.
Climate inputs are real hourly records (temperature, humidity) for the year 2024 across 82 European cities (Open-Meteo/ERA5), including a dense grid over France. Type any location: the tool automatically uses the nearest computed climate.
A high IP rating blocks liquid water and dust, not water vapour: it enters through thermal breathing and seal permeability. At night the wall cools faster than the enclosed air; as soon as it drops below the dew point of that air, condensation forms — even at IP67 or IP68. This is the typical failure mode of outdoor electronics: fogged optics, corrosion, leakage currents.
The tool computes the number of hours per year the wall stays wet, unprotected and then for each AirSponge area, and recommends by default the area that cuts this risk by 80%. Orders of magnitude from the model, confirmed in use: about 10 cm² of AS-B sticker per litre for a small IP65 enclosure, about 4 m² of AS-C tape for a 33 m³ shipping container. Unlike silica gel, the material regenerates spontaneously during dry hours — it does not saturate over the seasons.
Yes, no sign-up. Results are pre-sizing estimates, non-binding; for a study of your exact site, use the study request form.
The product rule is 10 cm² per litre — one AS-B size XS sticker. The simulator shows the detail for your climate.
Yes. IP68 sealing addresses liquid water. Water vapour always ends up equilibrating the inside with the outdoor climate, and day/night swings do the rest.
Hourly 2024 records from Open-Meteo (ERA5 reanalysis) for 82 European cities. In mountain areas the data point represents the valley — altitude is not corrected.