Do the fans run during sleep?

[Travtorn]

I realize that since a macbook is a much more confined space than a desktop, it needs a constant minimum of ventilation.
But does that also apply when it is asleep?

If so I would more often consider shutting it down entirely

Anybody knows?

 

[Capt Underpants]

The fans shut off during sleep.

If for some reason it hangs up, the fans will rev up really loud.

 

[GGJstudios]

Since nothing is running during sleep, the fans are not needed. If your Mac is hot at the time you put it to sleep, it may take the fans a short time to shut down, but they will not run in sleep mode.