I am working on a house addition project in chicago, IL area.
The existing house has a perimeter loop duct in concrete slab. how do i extend the existing duct (actually, it's like a big PVC pipe in the concrete slab) to addition area?
Or do you guys have any recommendation to heat and cool the additional space, it's about 300 sf. i am also thinking to install a mini-split heat pump if the duct connecting isn't possible.
any comments will be appreciated!