It is a fairly cheap solution for increased temperatures in the summer. With an average temperature inside the house of 29 degrees, this fan managed to reduce the temperature by 3-4 degrees in a 70-liter aquarium. If there is air conditioning in the room, it works additionally and there is an even greater drop in temperature. However, the fan makes a lot of noise, to be precise, its operating intensity is about 50-60 dB. Of course, one can turn it on and off and not leave it on all day, but if the aquarium is in a central location in the house, it may be annoying when it is running. Considering the price range of 20-25€, it is a good choice for cooling, but if you are looking for something quiet, then it is probably not the right solution.