I've got a dual-zone system in my two story home. The upstairs A/C does not
keep the upstairs cool at high outdoor temperatures (say above 85 deg).
However below that it does okay. I've had the repairman out to re-fill the
freon the last couple of springs, and this year it didn't last all the way
through the summer. Apparently I have a leak somewhere, just don't know
One possible clue... last week during mi-day I went up in my attic (where
the upstairs furnace/blower is located). Even with temperatures 85+ deg
outside, the attic was not as hot as I would have expected. Could the cold
air be "leaking" into the attic somehow?
The outside A/C compressors are Trane mfg.