FanControl is perhaps the best solution for customizing the fans inside your Windows PC. Thankfully, an open source, third party option is available. However, tinkering around in your PC's BIOS is tedious or even impossible, and OEM-provided software might be difficult to customize. It can also be regulated by OEM or vendor software installed on a laptop or a pre-built machine. The motherboard's BIOS controls the fans inside your Windows PC.