A fan is a must during hot days. This distributes air along your skin, so that sweat on the body evaporates faster and therefore cools down. When choosing a fan, it is important to consider your environment in which cooling must be created.
You do not want too much noise in your bedroom, so it is smart to opt for a quiet fan. In an office building or warehouse, the spaces are somewhat larger and it is smart to take a somewhat larger metal fan that can spread a large area of air.