I know this poll has been on here before but I think it was a while ago and I just wanted to see an updated number.
Heat radiates in all directions and dissipates through the aluminum body. While clamshell mode or using a keyboard covering slightly inhibits dissipation, it's not enough to cause problems or raise temps more than a few degrees, since the primary cooling is through the vents.I had one too, but took it off, because it does not allow heat to escape!
This arrangement allows for venting with the lid open or closed (for operating in clamshell mode). There is a solid panel under the keyboard, preventing any meaningful airflow.Mac computers have air vents that allow heated air to exit. The vents are in the back of the computer on the MacBook, MacBook Air, MacBook Pro, and Mac Pro computers.
Heat radiates in all directions and dissipates through the aluminum body. While clamshell mode or using a keyboard covering slightly inhibits dissipation, it's not enough to cause problems or raise temps more than a few degrees, since the primary cooling is through the vents.
There has never been any air intake or exhaust vents through the keyboard on any Mac notebook. For all Mac notebooks except the MBP-Retina, both intake and exhaust has always been through the vents in the rear near the hinge. The new MBP-Retina has intake vents along the sides at the bottom and exhaust through the rear vents, near the hinge.
Learn about the fans in your Mac
This arrangement allows for venting with the lid open or closed (for operating in clamshell mode). There is a solid panel under the keyboard, preventing any meaningful airflow.
I use a cover because I hate it when my keys get shiny from use.
I've been using MBA's & MBP's for years without any protective covers.
Just a little common sense & care results in a "like new" appearance 18 months later when I upgrade to new models.
Apple designed them to be used uncovered & did an exemplary job of it.
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Conversely, I really like the patina that develops on the keys of my various Macs.
It's a sign of use, enjoyment and its uniquely mine.