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Posted by yaofeng on August 11, 2005, 10:44 am
We are finally replacing the HVAC in our house. The furnace is
original in 1971, 140,000 BTU. Central air is 3 1/2 ton Trane put in
1987. The new ones will be both Trane units. The new furnace will be
92.5% AFUE 112,000 BTU. AC is the same tonnage at 15 SEER. The house
is 2,100 sq ft in NJ.
The HVAC contractor suggested raising the duct returns on the second
floor from the existing near floor locations to a higher location near
the ceiling when I told him our second floor doesn't get cooled that
well. The plan is to raise it without additional ducting by using the
joist space. Does it make sense?
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Posted by CL (dnoyeB) Gilbert on August 11, 2005, 3:03 pm
yaofeng wrote:
> We are finally replacing the HVAC in our house. The furnace is
> original in 1971, 140,000 BTU. Central air is 3 1/2 ton Trane put in
> 1987. The new ones will be both Trane units. The new furnace will be
> 92.5% AFUE 112,000 BTU. AC is the same tonnage at 15 SEER. The house
> is 2,100 sq ft in NJ.
>
> The HVAC contractor suggested raising the duct returns on the second
> floor from the existing near floor locations to a higher location near
> the ceiling when I told him our second floor doesn't get cooled that
> well. The plan is to raise it without additional ducting by using the
> joist space. Does it make sense?
>
it does and its simple. What effect will it have in the winter?
--
Respectfully,
CL Gilbert
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Posted by yaofeng on August 11, 2005, 12:26 pm
I presume the hot air will be recycled back to the furnace inlet, which
is not necassarily bad. The furnace just don't have to crank out as
much heat working on heated air.
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Posted by on August 11, 2005, 1:46 pm
What you will likely have is some pretty extreme stratification, where
the elevated returns are, besides reduced heating efficiency.
At least if he put the discharges near the ceiling with the returns
below, you'd have a manageable loop, just be overheating air at
ceiling.
What I've found to work very well, for heating and cooling is plastic
flow-diverters that magnetically attach to registers. E.g. instead of
cooled air flowing across floor to return, diverter makes it ascend for
a bit and mix with room air well above ankle-height. Much cheaper, and
more effective, IMHO than raising return.
OTHO, if return and discharge were reversible summer-to-winter, you'd
be in business.
HTH,
J
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Posted by Edwin Pawlowski on August 12, 2005, 1:13 am
> What you will likely have is some pretty extreme stratification, where
> the elevated returns are, besides reduced heating efficiency.
>
> At least if he put the discharges near the ceiling with the returns
> below, you'd have a manageable loop, just be overheating air at
> ceiling.
>
> What I've found to work very well, for heating and cooling is plastic
> flow-diverters that magnetically attach to registers.
If the duct is extended, you have two outlets. Open one, close the other,
depending on season. I've seen that done with good success.
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