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Old 06-19-2012, 03:33 PM   #1
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Southern front room temperature issues


I'm sure many of you have heard of this issue before so I'm sorry if this has already been answered. My home is heated/cooled through central air and every single room receives excellent heating and cooling except for the southern bedroom. I'm guessing the sun beams down on the room all day and it acts like a huge oven. There are UV curtains in the room blocking out 100% sunlight over two double hung windows. The room is completely dark 100% of the time. (Temperature issues present before so this isn't the issue).

I tried closing all of the registers in the house but the air coming out of the vent is still weak. So, as a result, in the summer the room is hot and in the winter the room is cold.

I tried one of those register booster fans and it doesn't help. And actually, I called a "specialist" and he said an internal booster fan MIGHT help although there are no guarantees.

If that doesn't work, and I'm guessing it probably won't, I thought about a small window unit but then there are energy and burglary issues as this room is on the first floor.

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Old 06-19-2012, 03:36 PM   #2
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Southern front room temperature issues


Where is the inside blower located in relation to this room? Are the ducts Y'd off ( one big run with smaller runs branching off to rooms) or is this one dedicated run to this room?

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Old 06-19-2012, 03:59 PM   #3
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Where is the inside blower located in relation to this room? Are the ducts Y'd off ( one big run with smaller runs branching off to rooms) or is this one dedicated run to this room?
Is it okay if I like to pictures of the runs?
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Old 06-19-2012, 04:08 PM   #4
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Old 06-19-2012, 04:09 PM   #5
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Old 06-19-2012, 04:16 PM   #6
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Southern front room temperature issues


You can have dampers installed at the duct take offs at the main trunk line, balance the air that way.
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Old 06-19-2012, 04:19 PM   #7
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Southern front room temperature issues


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Old 06-19-2012, 04:28 PM   #8
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Southern front room temperature issues


Unfortunately it looks as if those two take off's are far too close to the actual system. There's a thing called static pressure, relates to a sort of back pressure/air flow due to the end cap of the trunk line. The air in these two lines pictured is more or less trickling out on while the air is on it's way to the end cap. The lines further down, closer to the end cap, will have more pressure thus more velocity to their respective rooms.

So it's either relocate the duct line on the main trunk closer to the end or install those dampers right in the duct line where they take off from the main trunk plenum. Actually, you'd install them on the other lines and close them off either partially or completely. This will allow for more back pressure to the line(s) in question.

That's my take on the situation.
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Old 06-19-2012, 04:32 PM   #9
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Southern front room temperature issues


Btw, do you know if there are air veins in that first main 90, going from vertical to horizontal? If not there's going to be a lot of air turbulence right there, resisting proper air flow.
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Old 06-20-2012, 03:28 AM   #10
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Btw, do you know if there are air veins in that first main 90, going from vertical to horizontal? If not there's going to be a lot of air turbulence right there, resisting proper air flow.
I'm not exactly what air veins are.

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