My daughter's room faces north and does not get direct sunlight but the air conditioner doesn't seem to cool her room like it does the other rooms in the house. I can feel it blowing slightly through the vent but not as much as other rooms. Do you think there is a blockage or something in the vent? If so, what can we do about it?

Need to find what kind of ductwork you have sheet metal or ductdoard and flex duct.

Also might not have a good seal on duct or maybe a tear or break in line.

Might even have a damper that has wiggled itself closed.