The sensor is an accessory we offer that works together with our fan. It enhances its performance and provides more accurate data. To explain this better, I’ll describe each device separately:
Our SmartCocoon fan works in sync with your HVAC system. It receives signals based on the airflow and temperature inside the vents and turns on or off accordingly. Depending on your desired temperature (which you can set in the SmartCocoon app), the fan boosts the airflow as needed to reach your target temperature. One small limitation is that, while the fan accurately detects the temperature inside the vents, it can only estimate the room temperature using its internal sensors. In most cases this estimation is correct, but you may occasionally notice a difference of 1–2 degrees between the temperature shown in the app and the one displayed on your thermostat.
To improve this minor inaccuracy, we released an additional product: the External Temperature and Humidity Sensor. This small device works best with the fan’s auto mode (which prioritizes temperature control over HVAC synchronization). It measures the room temperature precisely and sends this information to the fan, allowing it to adjust without relying on internal estimations. An added benefit is its humidity tracking feature. You can view humidity levels in the app, see the humidex (the real or perceived temperature influenced by humidity), and even set humidity alerts, which is especially useful for customers with health concerns or for rooms used by children or pets.
In short, the two devices are designed to work together to give you the most accurate temperature management possible. While the fan works efficiently on its own, the sensor significantly improves its performance and eliminates temperature inaccuracies.