Fans can make you hotter rather than cooler, but the temperature at which you should turn them off depends on several factors, including your age and the humidity level
Source: [New Scientist](https://www.newscientist.com/article/2531606-you-should-turn-off-fans-when-its-too-hot-but-how-hot-is-too-hot/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home)