By default, Apple automatically runs your Mac's fans – with no way to configure them – and speeds them up when your system gets too hot. The free Macs Fan Control application allows you to manually control your fans. You want to do this for two reasons: to make your Mac run faster but louder, or slower but quieter. Apple's automatic control is aimed somewhere in the middle.
Your Mac throttles your CPU when it's too hot, slowing it down dramatically until the temperature gets under control. Usually, this happens before the temperature gets too high, but you can manually push your processor further by increasing the fan speed faster than Apple usually allows. That makes a lot of noise, that's why the automatic control is trying to slow it down.
On the other hand, if you hate the noise of the fans, you can lower them manually. Keep in mind that this will make your system much hotter and could cause system instability if you let it go too far.
Whichever option you choose, monitor the temperatures of your CPU and other components and make sure you do not damage your system. It is also possible that operating the fans at maximum speed for long periods of time may cause damage. Try not to torture your laptop.
Control the fans
Start with Mac Control Fan application download and moving it to the Applications folder. When that starts, you'll see a list of all your fans and the ability to set custom controls. "Auto" retains the default behavior, but opening "Custom" allows you to set a specific RPM value or a target temperature.
The sensor-based value option mimics the automatic behavior, but allows you to select the temperature at which you want your system to be. You can increase the maximum temperature if you want more performance or lower if you want your fans to be quieter.
In addition, the application also allows you to monitor the temperature sensors of your system. The main ones to watch are the central temperatures of the processor.
If you do not want the app to be open permanently, you can set up one of the fans and sensors to display in the menu bar with the help of the icon of the 39; application. Click the "Preferences" button in the lower right corner to access these settings.
This adds a nice sensor in the menu bar, which does not take up too much space if you display it on two lines.
In general preferences, you also have the option to launch the application at startup and display temperatures in Fahrenheit.
Image credits: Anake Seenadee/ Shutterstock