I don't think all the other reviews clearly tell the truth about this product. To avoid a bad buy (and unnecessary transport by Coolblue), I'll give you the following info. In a heat wave, if your whole house is very hot inside, then this unit is NOT capable of cooling rooms, not even a tiny bedroom of 10m². What the device does then: if you pour cold water (pour 5 x 1.5l bottles from the refrigerator into the receptacle) into the device, and point the device at you while watching TV or while sleeping, you will the airflow a few degrees extra cooling. But ONLY IN THE AIRFLOW ITSELF. To give you an idea: it was recently 28 degrees in our living room. With only the fan function, you get the temperature IN THE AIRFLOW (not : in the room) to 26.5 degrees. If you then switch on the cooling function, the temperature IN THE AIRFLOW (not: in the room) will drop further to 23.5 degrees. So 3 degrees extra cooling. Again: the room does NOT cool with this temperature drop, only the place where the "wind" blows out of the device. If that 3 degrees of coolness is worth the price for you, then you can buy this great fan. So don't expect any "magic effect"! If you want a fresh cool room, the only solution is an air conditioner. If you want to sleep/work/watch TV in a slightly cooler airflow, then it might be for you.