I've heard about this issue as well... where does the air escape from?
Are their holes in the fixture or around where the fixture meets the
drywall?

I'm curious if I should get the airtight units myself, as I need IC
type remodel fixtures.

Also, what kinda bulbs do you use in these things? I'm planning on
putting 16 in my 40x20ft living room in this pattern

____________________________________
| x x x x |
| x x |
| x x |
| x x |
| x x |
| x x x x |
--------------------------------------------------------------

could I get the wattages low enough to keep from sunbathing in my
living room?