One idea...
 

In addition to the other ideas here you should also check the vents themselves to make sure they are all the way open. Sometimes moving things around can push the little round thing that opens and closes it. Adjust that round mechanism so that the slats of the vent are straight up and down. That will allow the most air through.

This is designed so that you can customize the amount of air in each room. After doing that, I would leave the bedroom door open and all that should do it. Good luck!

I had the same problem. This summer, I started keeping the bedroom door closed. It made a world of difference the bedroom stays about the same temperature as the rest of the house.

We have the same problem. When the A/C guy was out doing the annual service for our unit, I asked him. He checked and the duct was not blocked. So, I just put a small fan on the floor in the main room pointed towards the bedroom door and that takes care of the problem when it arises. The guest bedroom is an icebox.

Maybe try closing all the other vents in the house just a little bit more and see if you get more airflow in the bedroom

Get new windows, [/B]

If the window in the master (I’m old school) bedroom faces west, have a temp reflecting film or even a new low e window installed. Payback on a new window is years though, but lower temp is instant. I did film on my master bedroom window.

Depends on house style (talking about CYV) and if bedroom faces southwest. IMO Most design CYVs has master bedroom furthest from air handler along with IMO inadequate size duct. IMO the smaller duct has less air flow when got larger ducts in living room.

You can increase flow little by adjusting flow ducts closer to air handler to get Little more air flow but still have air temperature problem running in long duct. Example in my house vent closest to air handler around 49 to 55 degrees. The air temperature at rear ( longest smaller duct) 56 to 61. I suspect With thermostat at front of house where air coolest the back bedroom doesn’t have time to cold room down before A/C at themostat reaches setting temperatures. Also, if bedroom faces S/W you have radiant heat from afternoon sun on window and walls.

I have the same issue, except fortunately, the bedroom in question is not the master. I had the tech from Munns over. He checked the system all over and could find no problem. Said it was probably due to the heat in the attic warming the ducts. I believe that this is normal for the majority of the homes with your floor plan.

We close our bedroom door and it's better that way---worth a try???

The temperature gun will accurately measure the temperature of the air coming out of the vents as well as the temperature of any wall, ceiling, or surface you point it at.

Knowing this information can then lead to a person taking the proper steps in addressing the inequities in temperature from room to room.

You're totally wrong about that. If you don't have insulation in the ceiling, then heat will RADIATE down through the ceiling and make the area below even hotter.

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my MB is east in 3 bed cyv. Furthest from unit. ALWAYs coldest in winter or hottest in summer ; go figure -

My extra insulation in attic dropped bill 10

Adding insulation between two unconditioned spaces will only slow down the heat transfer process, but eventually, both spaces will become the same temperature. At sometimes during the day, the garage will become hotter than the attic and the insulation will actually slow down the heat transfer upwards into the attic. Builders never insulate between unconditioned spaces because it provides no benefit in terms of long term temperature differences.

I used to think not insulating the garage ceiling would let the heat in the garage vent into the attic through the ceiling. I insulated the garage ceiling and found I was totally wrong. You are correct. The heat was radiating down through the ceiling and the insulation stopped that. Now my garage if the door stays closed, is about 5 degrees cooler than the outside air on a hot summer afternoon. I have my garage door insulated as well.