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Need a little more information before could answer. Is the master bedroom 1st floor or is it higher? (2nd floor +). Is the attic directly above the room? How many and what type/size windows are in room?
Generally, insulation factors (at attic/windows) are a reason for why a room is colder or hotter - especially on 2nd or 3rd floors.) This can be a different issue than a heat pump issue.
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