We are in process of buying a house that sits under a holding stack for a major airport. The stack is used when the airport is busy. At the moment, the airport is not busy.
It is therefore very difficult to get a sense of how noisy the aircraft might be during a stack situation. Our due dil on local area, by asking a couple of hundred locals is that 98% have never considered aircraft noise to be an issue. However, research shows our seller has in the past considered it an issue to the point of complaining to local press.