I would like to improve the air flow to the master bedroom in my house.
Presently, the air is not as cool as it should be. It's about 5 degrees
warmer than the other rooms. Physically, this bedroom is the farthest
distance from the main unit which is a Day and Night, 5 ton A/C. The house
is 1700 sq ft. All the other rooms have sufficient flow and cooling. There
are about 7 vents throughout the house. I tried temporarily installing a
stove exhaust fan just outside the air duct but that didn't seem to help the
air flow or the cooling. Any ideas on how to rectify this problem?

Thanks.

Hugh