I have a air handler in the attic, part of a Hyrdo Air system, not quite sure of the size. The unit short cycles, comes on for 10 seconds or so, goes off, does it again, then on for a short period of time.
The unit also produces a whistling noise in some of the rooms in the second floor. I had my service company out to look at it, they added a return, but the problems seem to be getting worse. Any suggestions!