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Old 07-06-2011, 09:25 PM   #1
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Adding ductwork to basement from attic.


Checked forums for ATTIC ac "reducting" and found only BASEMENT UNITS. I was wandering if taking ducts from attic to basement would create a different situation.


This is proposed floor plan of basement.
http://i1218.photobucket.com/albums/...asement3-3.jpg
The AC-ONLY air handler is in the attic with vents on ceilings of the main floor with basement under main floor of course. The house is heated with a boiler fyi.
I want to run ducts through a closet to proposed "family room" of diagram...fyi plans were reversed and now this will be a bedroom. I plan only one room for now, don't know if I will ever get to the other rooms, BUT wandering what the AC requirements will be for future other spaces especially the bath.

A couple questions: Use insulated flex duct or steel duct(with insulation added?)?
Is a return necessary and where to place vents?
Bring down "trunk" for future whole basement OR "branch" of one of existing "lines"?

I started to hang drywall on ceiling in basement and stopped because I must decide on the AC duct routing prior to drywall...this is why I'm being abrupt... thanks in advance for your help or direction...

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Last edited by Squeakyhinge; 07-07-2011 at 08:55 PM.
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Old 07-07-2011, 08:57 PM   #2
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Adding ductwork to basement from attic.


bump please, btw I'm not a pro, is the HVAC forum for "pros only"?

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Old 07-07-2011, 09:09 PM   #3
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Adding ductwork to basement from attic.


Check Manual D and J
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Old 07-07-2011, 09:33 PM   #4
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Adding ductwork to basement from attic.


You threw the book at me. I thought "insulated flex duct" vs "steel" is about condensation issues also, not just velocity and friction and all that. I'm going to have to find out my tonnage and do some other homework. As you wish, JJ. Thanks for reply.

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Old 07-07-2011, 09:55 PM   #5
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Adding ductwork to basement from attic.


Basements take very little to cool them. But humidity will be a concern.
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Old 07-08-2011, 07:06 AM   #6
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Adding ductwork to basement from attic.


Yes, I will have to rely on the dehumidifier. Wandering if I have two, will they run less or just suck more moisture? The one runs all the time at 50%. Thanks Beenthere.
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Old 07-08-2011, 04:51 PM   #7
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Adding ductwork to basement from attic.


With 2, they won't run all the time. Once the humidity is below set point, they will shut off.

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