I will explain what I would "Ideally" want. I would like the HVAC in the basement ceiling to Not require a soffit. Plumbing seems possible because the holes for the most part will be small enough to not affect the structural integrity. So the question is what is possible?
There is also a similar post here. They talk about the limits on what can be done to floor joists. From my understanding, it would not be possible to install any ducts through the floor joists. If I am wrong, please let me know.
Last would be what is the alternative? Is it possible to run the ducts through the roof attic? (I assume that opens a whole different set of issues) Plus that doesn't fix the cold air return which should be on the bottom if I am not mistaken. I would really like to avoid soffits if possible but everything I am researching is pointing that direction.
EDIT: The house is an existing home. The basement floor to ceiling is already at the 8' mark. The joists are typical dimensional lumber (not engineered)
Radiant/Hydronic Heating - The idea is awesome. If I was doing a new construction, this would probably be one of the best options.
"low-volume, high-velocity" ducted system - First time I have seen something like this. Its very interesting. I did read there are some disadvantages like noise and it can be costly to add.
To Clarify a bit more, I would like to keep the costs low so redoing the entire heating/cooling system is probably not going to be an option. (of course it depends on what costs would be). I intended to keep with the conventional heating/cooling and was more or less looking for a way to still it but avoid soffits. The image below is an example of what I had original wanted but it doesn't seem like that is up to standard?
EDIT-Image below is a not my current hvac. Its also a BAD way to do it. Was using it as a reference.