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forcedreno2012 04-23-2013 08:49 PM

Re-location ducts with a new system
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Below is a pic of the living room in the house.

The unit is properly sized and they did the manual J etc. Just working on the ducting and the red x shows the current location of the two air registers in the ceiling.

The room faces the west so It does get warm in the afternoon in the summer. Does it make more sense to re-locate the ducts to where the green x's are on the warmer side of the room or would it not make much difference? Would I gain anything with respect to keeping the room cooler.

Thanks Robyn

beenthere 04-23-2013 09:53 PM

Adding a supply between the 2 green X's would probably help more then just moving the existing.

HVAC1000 04-23-2013 11:55 PM

where are your return airs in that picture?

forcedreno2012 04-24-2013 12:43 AM

Beenthere..not sure if we can add another run to make it three in there as we would mess with the manual J I think? Wouldn't that add to the cfm's? right now its sized for two 7 inch ducts.

HVAC the return air is to the right of the red x on the right side. is basically parallel to them on the floor.


Doc Holliday 04-24-2013 12:57 AM

bullhell. a manual j just satisfies what a room's cfm should be. how it's delivered is up to the contractor.

keep supply grills close to the inner wall, vents blowing towards the window to fight the heat load.

btw, if you get three different contractors to perform three different manual j's, you'll get three different results. good luck, I hate conversations of this matter.

forcedreno2012 04-24-2013 01:09 AM

I hear you Doc on the issues and the discussions - try getting quotes on different units and its crazy. And don't even ask why one unit is better than the other :censored:.

I started researching and at one point said bugger it, I'm not getting the HVAC replaced...that of course was before it got warm :laughing:.

I am grateful for all the advice here though, it has saved me some time and led me to get rid of some definite shysters and we have a great installer now, local team and they have been very accommodating for us.

Soooo back on topic, it sounds like from the answers so far I would not gain much by moving the vents, which I am okay with - it was a thought I had (happens now and then) before I tore the old stuff out and ran the new.


beenthere 04-24-2013 03:41 PM

Do any of your other rooms/areas have a problem cooling. If not, loosing a little air to those areas won't hurt anything.

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