Tin foil was the culprit
A few years back I was living in this a single apartment I was renting.
- And every time that the central heating & air conditioner would come on I would hear this crumpling of paper type sound that was almost appreciate a rattling sound.
It was driving myself and others nuts forever! I could not figure out why every single time the central heating & air conditioner would come on that this noise would be going on, then well, a single day I finally had enough of it & I wanted to investigate into this. The noise was only coming from the air vents in the study room. In the bedroom & other parts of the apartment it was not happening. So I decided to get a ladder & go up to have a look at the air vents of the central heating & air conditioner in the study room. The air vents were in vaulted ceilings so I needed the ladder. When I had a deep look into the air vents I found what was going on! There was tin foil in there for some reason. Before I detachd this tin foil from the air vents of the central heating & air conditioner I wanted to check with my property owner first to make sure it wasn’t there for a reason, but my property owner did not suppose why it was there & was surprised himself! So I went back up there, took off the air vent cover & got the tin foil detachd from the air vents of the central heating & air conditioner in the study room area of the house.