I've decided to landscape the backside of my house and am trying to
decide how I could hide the air conditioning unit effectively. Our
a/c repairman has told us that the unit needs lots of air flow all
around it, so I'm wondering if there is a way to hide it a bit without
blocking the air too much.

My husband suggested an oversized lattice type box structure (leaving
the back space between the unit and the house open) which would allow
air through the holes in the lattice. I'm not sure if that would
work. I had thought about putting a 4 foot picket fence around it.
I'm mostly concerned with the view from the back yard, so the top of
the unit doesn't have to be covered, although it would be nice.

For those of you who have disguised or hidden your a/c units, how did
you do it?