wall padding? / what is this?

[Jerome W. Young]

This was located above 4 a/c condensers on a wall between two houses. Never seen one of these before. Is this for noise absorbtion?

[John Arnold]

That's protection for when the AC guy needs to bang his head against the wall.
Ok, maybe not. I like your theory better.

[Nolan Kienitz]

Jerome,

You got it - Sound Absorption.

Not sure what rest of wall area was or windows in the area, but that blanket/padding will do a good job of sound absorption to keep the sound waves from bouncing/echoing back/forth between walls.

[Richard Rushing]

Yep... my bet is that the units were sitting outside a bedroom.

RR