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No clue to your house layout and duct work that you have:
a blocked or broken duct(s), an air handler inoperative,
critters camped in duct(s), some combo of the above.
Many older duct systems have a "valve" in a main runner
which may be "turned off" or broken or stuck closed.
Many newer systems use cheap azz ribbed plastic and
the $8 hr "HVAC installer" did a poor job and over time
that duct(s) has sagged and blocked itself off.
A good, nimble HVAC man should be able to diagnose it
in under an hour. Worth it, imo.
My guess, from afar...
GL,mD
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