Packaged air-to-air air conditioning units, designed and manufactured to work in industrial environments, in presence of dust and vibrations and exposed to high temperature. ACU-Q Series conditioners have been designed to cool electrical enclosures and containers: every component has been designed, selected and placed to satisfy all the needs of these environments, to simplify the access to the internal parts and to minimize the maintenance. The units must be installed on the floor, on horizontal surfaces; the air is taken from and sent to the environment to be cooled through bellows with anti-vibration stop to canalize the air. The conditioners are provided with a remote control panel which allows the setting of the temperature and of other parameters. The conditioners can be provided with a COES device which guarantees the working continuity also in case of short temperature peaks up to 80°C; in addiction they can be supplied with an electrical heater for warming the cabin, allowing to work properly up to external temperature of -40°C.