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The cold air is not getting to the other vents, this can have several common causes:
1. Too long of a run for the other vents. Air takes the path of least resistance, if the other vents are 20' further away they will have lower pressure coming through them. Seal the ducts and possibly add a booster fan.
2. Disconnected duct. Check all the lines, sometimes one gets disconnected and is blowing cold air into an attic, crawlspace, or basement.
3. Ducts are running through unconditioned space like an attic. If the duct work spends any time in a 130 degree attic, it raises the temperature of the cooled air. These ducts should be thoroughly sealed and some form of additional insulation put on top, R-30 to R-60.
4. Duct leakage. All ducts leak, often 10-30%. Seal any accessible joints with mastic (tile glue) or foil tape. Don't use Duct Tape.
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