There is a loud pitch whistling noise in my walls, at first it was in another room in the wall and now the noise has changed on the same side of the house and into the other room all in less than 24 hours

Do you hear it all the time? When Running water? When AC is on? Give us a little more info.

Explain the type of whistle. Teapot type. Does the volume change?

Let us know.

Chuck