Air handling unit for room air exchange with high efficiency heat recovery (~90%) and summer dehumidification, with the possibility of summer and winter integration operating as a heat pump (refrigerant R134a). It uses outdoor air only, and it is designed for horizontal ceiling installation. UAP 201‐PDC consists of three separate modules: 2 fan modules and a recovery/treatment unit, which can be installed close together or in different positions to make installation easier and to optimise the available space. The machine is equipped with a complete cooling circuit (R134a), pre‐treatment coil with ½" modulating valve to be supplied with cooled water (15 °C), EC high efficiency modulating fans, by‐pass for free‐cooling, and G4 filters (ISO coarse 50%). The heat discharge takes place in the stale air exhaust ducting, thus reducing energy consumption both in dehumidification and integration modes. The unit can be managed with User Display, with an external device (via digital input), or with RDZ Wi electronic control unit.