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Old 11-13-2014, 10:17 PM   #1
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Some vents blow cooler air than others


My furnace blows up to tubes that immediately split left and right as seen here:



The route to the left goes the length of the house, and T's off perpendicularly a a few times, leading to a handful of vents across the house.

The route to the right just leads to two vents, and both are much shorter runs than those that went off to the left. It splits right away into the two directions:



These go no more than 10 feet, and each lead to just one vent.

The problem is that these latter two vents don't blow as hot as all the others (the ones from the left route described above). They seem to blow equally as hard, or very close to it anyway. It's just that they are warm as opposed to pretty hot like the others. It's 30 degrees out now so it's easy to tell that those two rooms are much cooler than the rest of the house.

I've found the damper in each of the runs in question, and confirmed that they are wide open. I've also run my hands all along both these runs in question about 20 times, and can't find any obvious leaks.

Any other ideas as to what could be causing this? I'm at a loss at these point.

Thanks!

Last edited by 99miles; 11-13-2014 at 10:46 PM.
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Old 11-14-2014, 09:18 AM   #2
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Do these rooms have return air vents? If not try leaving the doors open a little.
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Old 11-14-2014, 09:51 AM   #3
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No, neither have return vents.

One room is the kitchen which doesn't have a door (just an open doorway), and the door to the other room is always open.
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Old 11-14-2014, 11:46 AM   #4
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Is everything made out of the same material and insulated the same? Do the cooler vents have ducting that runs through a colder area like above a garage?

I can't see your pics since I'm at work so maybe my questions are easily answered by looking at the pics.
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Old 11-14-2014, 04:31 PM   #5
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Yes, they are all the same material.

No, they all run through the same area (exposed basement ceiling).
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