These particular windchimes are more like musical instruments than clangers or clinky. I live on the dead of a dead end street and they're supposed to be good luck/Feng Shui for that. I also have a barky terrier who cost half as much and sounds worse. I have 4 very large deep toned windchimes (like church bells), we've invested well over $2k into them, they're tuned and are melodious. I really want to know more about these super loud wind chimes that can be heard several properties away and these fabled indoor wind chimes. I do find this long running argument amusing, though. I personally don't care one way or another about wind chimes. I just think that the arguments that you repeat so readily are flawed. if they're your mortal enemy, you can hate them all you like. Hearing your dog is one thing I just don't want it to be threatened by it. though I would expect more alerting to mail carriers than mountain lions, or at least that's my observation. If you want to put dogs in your yard, I would tell you to safe guard them against said mountain lions, but so long as they stay in your yard, that's fine.
Do they have to go in front of a vertically oriented heating/cooling vent? Is there a servo involved? Does the sound magically stop when it reaches the wall of the house? (People here seem to be able to hear wind chimes from like an acre away, through any number of trees, and around a house or three, so why would it matter if there were a wall between? I get the feeling it would be just as objectionable to you. I don't need them, I just want to know the mechanics of it. You keep suggesting putting wind chimes inside.