||During winterperiods, more inhouse air will be aspirated compared to outside air. As a result, the relative humidity value of the air might rise. Consequently, the moisture absorption capacity of the air will be lower. In order to integrate more dry air in the system, outside air needs to be mixed with the house air to a higher extent. This outside air needs to be heated till the desired mix temperature is reached. For this sake, a heating coil for warm water can be installed in the air mixer. This coil should be connected to a central heating boiler.