I assume cool air is roaring through the master room vent. Does the other

room's vent have significantly less flow? If so, it could be the vent setting, a crimped vent (as others have said), blockage or just due to ductwork and distance. Our master does not get as cool as the other bedrooms upstairs because it is the furthest from the blower. The cool air is going to take the easiest exit. We open the master vents fully and the others partially to balance coolness. Check out your ductwork in the attic.
One other random thought ... do the dark curtains get really warm? Is it possible they are absorbing more sunlight while the master windows are shaded?

In response to this post by Baltimore Hokie

Posted: 06/30/2020 at 4:52PM

My house has a mystery hot room -- Baltimore Hokie 06/30/2020 09:37AM

I assume cool air is roaring through the master room vent. Does the other -- 86TechHokie 06/30/2020 4:52PM

Check the air temperature of the vents in the morning? Also, I am curious -- HokieZig 06/30/2020 4:38PM

Portal to another dimension? ** -- reestuart 06/30/2020 10:55AM

So learn the hard lesson I did but quicker.... -- HokieForever 06/30/2020 10:50AM

Is there attic space above? If so, check the insulation. -- MP4VT2004 06/30/2020 10:43AM

Mystery hot room-is that code, like white rocks?? ** -- TD-Tech 06/30/2020 10:26AM

Check for blocked air ducts. Sometimes they crimp -- GreenvilleVT 06/30/2020 09:51AM

And they are often secured with duct tape to the vents. -- GreenvilleVT 06/30/2020 09:57AM

Vaulted ceiling -- hot air rises. Stratification** -- 133743Hokie 06/30/2020 09:51AM

The vaulted room (master) is the cooler room. ** -- 48zip 06/30/2020 09:59AM

Yes. The hot air rises into the vaulted area leaving the cooler air below. -- 133743Hokie 06/30/2020 1:48PM

Yes, but usually the air vents are in the ceiling, as opposed to 1st floor. -- 48zip 06/30/2020 2:26PM

Right. Because the heat has room to rise into the vaulted portion. ** -- NokieHokie 06/30/2020 10:26AM

My living room is 2 story, and I never had an issue compared to other rms -- 48zip 06/30/2020 10:36AM

Yeah if the thermostat is in that room, it is moot. ** -- NokieHokie 06/30/2020 10:37AM

Which room is closest to the (cold air) supply duct? The "other" room? -- 48zip 06/30/2020 09:47AM

Morning when you wake up, or mid-morning after the sun has gotten to it? -- Hokie360 06/30/2020 09:46AM

I'm thinking with the vaulted ceiling, the heat rises in the master. Then -- NokieHokie 06/30/2020 09:45AM

Is the hot room over a garage? Our warmer room is.... ** -- Tuckahokie 06/30/2020 09:40AM

No, the master is and it is the coolest room in the house -- Baltimore Hokie 06/30/2020 09:41AM

Is it also 4 degrees cooler during the winter? -- EDGEMAN 06/30/2020 09:44AM

I assume cool air is roaring through the master room vent. Does the other

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