It could point to many things, including aggressive power profiles, background software updates or even dust building up.
Laptops generate heat. You can't really avoid it. Even energy-efficient models are still producing some level of heat. To try and keep things cool, your laptop fans should kick into action when you're doing something that pushes it hard, like gaming. By design, most laptops will ship with adjustable fan speeds that keep temperatures cool without too much noise. You'd usually expect the fans to quiet down, although they won't necessarily stop completely.
That isn't always the case, though. You might hear your laptop fans spin up even when you've closed all your apps. Power settings can have an impact, but so can dust and debris clogging up your case. You'll need to work out whether the noise is normal, because if it isn't, you'll need to fix it.
Closing the windows on your desktop doesn't stop everything happening on your laptop. Apps run in the background, with running processes that continue performing tasks under the hood without you realizing. These all create demands on your processor, RAM and storage. More power means more calls for the fan to spin.
Dell, for instance, recommends reviewing your startup apps to keep the loads down on your CPU, which should help prevent your fans…
