Air Conditioning - Central AIR not cooling one room

I have battled an apt complex for over a month..Due tothe high temps in Houston...Avg 90+ feeling like a 100... We have had to run the AC much lower...70-73 to keep the inside comfortable...but the master bedroom which is furthest from the Fan ....makes this room very stuffy. The closest room gets very cold including a bathroom.. We have been told to close off some vents..but I wouldn't expect all Ait to go through just one vent? Does it...We had to change out the thermostat due to it not cooling good and it wouldn't shut off when it got to the desired temp.. Now it works good but the AIR still doesn't get to the furthest room. Any suggestions..

Yes close all the other registers. JUST A LITTLE BIT Then see what you get. Filter clean or new????

ED;)

Yes filter is less than a month old and I checked that due to the higher usage..Does everything usually go through all one vent.. I have been in a Manufactured Home before and there were 2-3 vents so air was distributed much better...Being this is in a wall and not underneath...Very hard to tell why it doens't cool more.. I may close off all at night and see...

What kind of building are you in now? Where are your ducts routed? Could there be dampers on the ducts?... and one or more were closed and/or the wingnut came loose and the damper went closed tby itself? A damper is different from the register, you know. With houses with basements, usually they put dampers in the ducts, that can be controlled. I have actually found some, in my line of work, that have closed by themselves. And in other cases, someone, for some reason during some time of the year decided to close some down.

Wow, i don't know how you can get a house in 100 degree weather to get down to 70 degrees...

Not enough air is coming to the master room, the way to fix that is to add a damper in the main insulation tubes to direct more air in that room.

I am having a similar problem at my apt. I have no problem cooling my living room, dining room, and second bedroom. My problem room is the master bedroom. I have a good amount of air coming from vents in three rooms listed above, but I have just enough air coming out of the vents in both bathrooms to cause a candle flame to flicker and just enough air coming out the vent in the master bedroom to blow the candle out. Closing or opening the vents in the second bedroom and the dining room neither increases or decreases the amount of air coming out of the vents in the bathroooms or the master bedroom. This would seem to indicate I have two cold air lines - one that services the three rooms I have no trouble cooling and the other line that services the areas I have trouble cooling. I have had maintenance come in and they insist the A/C unit is in tip-top shape and they can spot no blockages of the duct work. I was hoping they had went into the attic to check the duct work but I doubt they did. It would appear I am left with two choices: Either go into the attic and see if I can spot some problem or buy one of those portable air conditioners and use it to cool the master bedroom. I would just go with a window A/C unit but I don't think they will allow me to use one of those.

Wow, i don't know how you can get a house in 100 degree weather to get down to 70 degrees...

Not enough air is coming to the master room, the way to fix that is to add a damper in the main insulation tubes to direct more air in that room.
We do it all the time. Proper sizing, good insulation values and good construction.

I am aving the same problem where even the bathroom cools more than my room. I swith the vent rom the bathroom to the room and still doing the same. I need help sumer is here and it's hot

Are you leaving the door open? If you don't have a return-air duct in the room you must leave the door open to get airflow.

Do your neighbors with similar apartment room layouts have any troubles cooling their bedrooms? Is this the first summer you have lived in this apartment, or did the AC work OK in the master bedroom last summer? Its possible that the duct design is just poor to begin with, as many apartment complexes are built cheaply. I'm guessing most landlords won't spend much time trying to resolve your problem, as long as their service tech's say the basic A/C system itself is operating OK.

In addition to the suggestions already offered, make sure the bedroom curtains/drapes are closed as much as possible to reduce the heating effect of the sun. You might try a box fan placed in the hallway to help move cooler air towards the bedroom.