hi papa -- it's not 60 Hz current home; it only occurs when the air
conditioning is cycling on -- otherwise no sound...

"PaPaPeng" wrote in message
...
On Sat, 28 Aug 2004 12:08:18 -0400, "Allen S."
wrote:

c i have a problem with vibration in my
(spare) bedroom ceiling that i cannot stop -- finding the source is
easy --
the furnace and a/c evaporator is directly overhead. As far as i can tell,
there's nothing wrong with either unit -- i suspect that when the home was
originally built (about 5 years ago) that somebody did a lousy job of
hanging the sheetrock and/or isolating the upstairs unit.



Whatis the frequency of the vibration?
The 60 Hz house current hum?
The furnace motor vibes?
A squeal?
Rattles? from the water pipes?


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