Alternatives to HVAC System in an Unconditioned Attic
I have 2 floor, 3200sqft new construction in NJ, the contractor are currently considering putting the 2nd zone hvac mechanics and ductwork in the unconditioned attic. Off the bat, i already know that is a bad idea. On top of that, the entrance to the attic is a pull down staircase. So what is the best approach to fix this issue? I really only have two idea in mind..
– The most cost-effective and sensible way, to me at least, is to relocate it to the basement and run the duct thru some closet. Keeping everything in conditioned space. But the basement is only 7′ 9″ high and with the additional duct work, im afraid itll just make the basement even less desirable to use as living space. Secondly, would the system be strong enough to reach all the rooms on the second floor? I will also be giving up some sqftage to accommodate the ductwork.
-Condition the attic space. Is this the best solution? accessing the attic is a pain but shorter duct work definitely will help.
So I’m wondering what you would do in this situation. And is there an alternative that would make more sense?
I havent decide on insulation yet with the contractor, But i do want to spray foam to seal as much air leaks as possible. Given that my exterior studs are 2×4 , i dont have much choices between the studs. do a flash and batt? use rockwool? or just fiberglass?
I spoke to the contractor about exterior foam, he’s saying itll cost way too much to add 2inch foamboard since i would have to alter the trims of every window. The most he said he can do is 3/4 foamboard, which is better than nothing I guess. So should i push to get the 2″ exterior foamboard or spray foam the interior?
appreciate anyone that can shred some light. Thanks.
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