I stink at explaining things, so I do the second thing I am worse at, drawing.
Maybe this will explain it better.
The bright red and blue lines are the line set right now, they run in the attic and throw ceiling that I can not get to. The power is run in the walls and attic as well. Power labeled in yellow.
This is what it would take to bring it all into the greenhouse. When I was only thinking of using water source that was doable, but adding another line set and all that brazing would be a nightmare. Plus really long runs that might be too much for my oil return. I can just barely get under the stairs, and would be tying into the power already going to the air handler. The wire is ok though because it was set up to use strip heat, that I have completely taken out. Also I didn't draw the second air handler in the picture. Darker red and blue lines are the new line set.
This is what I am thinking will be easiest and best, I'll need to build a heated box for the water coils and pump though. That is the only down side to doing it like this.
