Cold Air Return
My husband and I have recently moved from a ranch style apartment to a second floor unit. We have no real complaints so far. However, our apartment shares cold air returns with the apartment down stairs. This isn't a huge deal, but every once in a while if someone down stairs is standing in just the right place when they talk we can hear them as if they are in our apartment. They aren't being too loud by any stretch, it's just heading right up the cold air return.
Does anyone have any advice on how to mitigate this noise? I'm a bit creeped out by it because for the past six years we could hardly hear anything from our neighbors. Now I get creeped out hearing them in our living room, and concerned about how much they will hear from our bedroom, or how much we'll hear from their's. I'm wondering if there's a filter or something that we could put in the cold air returns to dampen the noise? Any other ideas?