"idreos" wrote in message
ups.com...
For the last month or so I've noticed a low rythmic rumbling noise
coming from one of my Trane air handlers. Its similar to the rumbling
noise heard accasionally from a kitchen refrigerator.
The air handler is original (18 years old) Its outside heat pump was
replaced last April.
The rumbling can be heard at the room air registers. It is not loud and

barely noticeable but I was wondering if this is normal. The air
filters are maintained monthly.
Thanks for your help


If it never did it before, it is not normal.

Check the motor and blower bearings. Could be they are starting to go and
causing some reverberation.