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Old 09-29-2009, 08:32 AM   #1
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Making ductwork better question


I live in an old house with a woodburner on the main floor, I have a new heatpump with the electric (toaster strips) for the auxillary heat. I have a few questions about my duct work to make things more efficient. The kitchen is farthest from the handler and two 6 in round ducts come off a main to supply. Would upgrading them to a 7 in round with properly sized vents make a difference as this room is quite cold.
Also would insulating the ductwork make a difference? The basement is pretty much unusable so heat is not needed. I have the foil tape to seal the joints. I was wondering if I should make another cold air return near the woodstove so that I can equalize the temp (from the wood heat) with the variable speed fan.
Any suggestions would help. Trying to get the best out of the existing ductwork. Old houses are not the easiest to heat. I do love the heatpump but the electric bill was quite high when the toaster strips were running.
Thanks
Linda
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Old 09-29-2009, 09:46 PM   #2
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Making ductwork better question


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Originally Posted by signpainter View Post
I live in an old house with a woodburner on the main floor, I have a new heatpump with the electric (toaster strips) for the auxillary heat. I have a few questions about my duct work to make things more efficient. The kitchen is farthest from the handler and two 6 in round ducts come off a main to supply. Would upgrading them to a 7 in round with properly sized vents make a difference as this room is quite cold.
Also would insulating the ductwork make a difference? The basement is pretty much unusable so heat is not needed. I have the foil tape to seal the joints.
Yes and yes. Increasing the the two 6" ducts to 7" ducts will increase air delivery 35%. And sealing/insulating the ductwork could make a major difference if you're loosing heat from leakage and conduction in the basement.
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Old 09-30-2009, 04:29 AM   #3
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Making ductwork better question


Increasing in size will help some. But how much can't be told without knowing where the 6" supplies are attached.
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Old 09-30-2009, 10:09 AM   #4
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Making ductwork better question


The 6 in round ducts are side (at an angle) takeoffs at the 26' and 28' mark of a 30 foot trunkline that starts out as a 10" by 20" and gradually ends up as a 8" by 12". Would placing them (or one of them) somewhere else ....like at the end of the trunk help?
Thank You for your advice
Linda
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Old 09-30-2009, 10:17 AM   #5
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Making ductwork better question


Probably not.
Since the further down the trunk. The less pressure in it.
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Old 09-30-2009, 07:06 PM   #6
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Making ductwork better question


I think the trunklines are OK.
I would insulate the exterior walls of the basement, and add a supply duct to heat the area beneath the kitchen.
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