You would or should also weatherize that attic and make it part of the conditioned space.
Moving ductwork in attic.
According to nrel researchers david roberts and jon winkler moving the ducts from a vented attic to a new location inside the conditioned space will reduce electricity used for cooling by 15 to 20 and will reduce the size of the needed air conditioning equipment by 0 5 to 1 ton.
Venting an attic is essential for a number of reasons including.
Map out the current a c ductwork by going up into the attic or crawl space.
You might think you have every single hole sealed but even so new leaks can occur without you even knowing about it.
Seal supply boxes with mastic.
Strap the flex duct to the attic framing at 4 foot.
Going over every inch of ductwork is a laborious process especially when a section of ductwork is in a location that s difficult to reach.
Also attic ducts often leak.
This way you could rip out 0r maybe re use that duct in the basement.
If so you could put the new system upstairs in a closet and have all the duct work in the attic.
Instead i covered my attic ducts with insulation.
The attic ductwork is flex duct work.
Insulate and air seal the floor with open cell foam put ductwork and mechanicals in the attic install a radiant barrier and mastic seal the ducts.
It was new when the ac was put in 7 years ago.
I chose unfaced batt type so that it would stay in place.
Tips for running ductwork through the attic ideally in a passively vented system the attic is completely sealed from the living space by gypsum board and caulking along all ceiling joints creating an airtight seal.
I vote for the attic.
House flipping brothers dave and rich show you how to move and install ductwork.
I believe that moving ducts out of the hostile temperature environment of the attic is obvious.
However unless you have new construction is highly doubtful that you can find an alternative.
Lentz suggested moving the ductwork to one side of the basement which on paper of.
While the attic install isn t ideal it beats the problems that come with ducts.
Strap ducts out of insulation with 3 ductstraps per specifications.
Connect the end of the flex duct onto the circular end of the rigid duct with self tapping duct screws.
Find the ductwork that leads to the a c vent that you wish to move and mark it with colored tape.
Locate the screw sticking up through the ceiling and mark this with tape for reference.
Recently i had another hvac company come out and put in a new bathroom vent and they told me they believed the duct work was full of water.