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Jun 10, 2015 9:23 AM in response to rene.peglionby sterling r,Hello Rene,
It sounds like you are concerned that there may be processes running on your Mac when it is sleeping causing the fans to continue to spin. That may very well be the case with the Power Nap feature if your computer supports it. You can turn that off in the System Preferences:
How Power Nap works on your MacTurn Power Nap on or off
The Power Nap setting is in the Energy Saver pane of System Preferences.
Desktop computers
Choose Apple menu > System Preferences, then click Energy Saver. Use the "Enable Power Nap" checkbox to turn Power Nap on or off. The default setting is on if your desktop Mac uses flash storage (not including Fusion Drive).If not or the issue persists then I would next reset the SMC on your computer:
Resetting the System Management Controller (SMC) on your Mac
Thank you for using Apple Support Communities.
All the very best,
Sterling

