Yes, you paid for a working unit and thats what you should get. If you're not getting sufficient airflow through the duct its possible that the duct tubing is crushed somewhere (happens during construction) along the way. Adding another furnace near the master bedroom might be the least costly solution.
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2014 Micro Lite 19fd
2015 F-150 5.0L V8 XLT Crew Cab, 4x4, Tow Package, 36 gal tank, 3.55 locker, 1891 payload, Integrated Brake Controller, Roadmaster Active Suspension
Wooden Spoon Survivor