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Barb M, you described vibrations coming from your adjoining condo neighbor's air conditioner, to your common wall. The way to damp low-frequency noise like that is with plenty of massive material, rather than light porous stuff. My own front entrance, for example is only about 10 feet from the street, and when I replaced the original hollow plywood door with one of solid lumber, the noise of passing cars was reduced about 90 percent. Your condo managers probably wouldn't let you fill the common wall with concrete or plaster, but you might find something less permanent that you could add on your side, say a couple of inches of drywall panel (firmly attached, for best results). It would cost some floor space but might be worthwhile. Consult a contractor. Cheers, Joe J. R. Bruman (818) 789-3694 3527 Cody Road Sherman Oaks, CA 91403-5013