How can I keep my MacBook Air's battery cool?
Apple only provides a few recommendations.

Use the computer on a hard surface:


  Using the computer on a soft surface like a couch, pillow, bed, or your lap can trap heat requiring higher fan activity. Using the computer on a hard flat surface like a table or desk allows for optimal radiation of heat.


Don't block the fans:


  Make sure the vents remain unblocked to allow your computer to perform at its best.


On the MacBook Air, the fans are located in back.