... temperature: Lower temperature by water evaporation.Refrigerate in effect, Air cooler can lower temperature 4-12 centigrade.d: Removing dust and ... ventilation:Air cooler increase the air oxygen, filter the dust and smell, improve ... cooling effect evaporative air conditioner: 1. 4 in 1: Air cooler,Fan,Purifer and Humidifier.2. Honeycomb wed pad for optimum ...