I have a relatively new house (built January 2005). We have a forced hot
air heating system with central AC. There are 2 air units, one located in
the basement, and one located in the attic. We also have 2 outdoor AC
When we are using the AC unit located in the attic (which handles our 2nd
floor and great room zones), especially when it's very warm out, we will
intermittently hear a repeating whooshing noise in certain walls/rooms.
Based on where I hear the noise, it seems to be the piping coming from the
attic unit and heading towards the outdoor AC units. It happens every few
minutes when the central AC is running.
I assumed this was normal (I've never owned a house with central AC before).
But, I called our heating/AC company last summer and mentioned it, and they
indicated that it sounded normal to them based on my description (though
they never came down to listen).
This summer our neighbor (who owns basically an identical house to us, it's
a new development) commented on the sound, saying he never hears it at his
house. I called the heaitng/AC company again, and they came to listen, but
of course it was a cool day and the noise never happened. Based on my
description, the guy said it sounded like the pipe rubbing against the
drywall instead of behind the insulation, vibrating and causing the noise.
The only solutions he offered were tearing up the wall to fix the pipe, or
running new pipe through the attic and down the house, at a cost of $500 or
less. Neither option sounded overly appealing to me.
I accepted the explanation, but now I'm starting to have my doubts because I
can hear the noise in other parts of the house I didn't notice before.
The sound almost sounds like pressure being built up, then released (the
whooshing noise), but it is hard to describe.
Does this sound familiar to anyone? Does the repair guy's answer make any
sense, or is there possibly a simpler solution to the noise??
It's starting to drive me nuts....
Thanks in advance!!