How to Install Radiant Heat in a Pre-Fab House | This Old House

Interesting video!!

Why is he running Windows XP on an iMac?

May I install it under concrete floor ? will it works ?

Heat cold climate heat loss calculation chase for pipe and wires insulation pipe for heat leak outside foam insulation urthiane high or value out board 2” insulation double conventional wall for heat half heat pass outiside heat water radiant floor heating frames and decked osb plywood conventional lumber pre-cut machine computer machine. Prettily holes holes for radiant floor osb sheeting bead adhesive subfloor. Radiant heating pexheating tubing heated water aluminum channel snap undercode(?) pex water heated through aluminum track foil track snaps unto champer? Glue? Unto subfloor? Floor panel works better upside down then drilled? Same nails or glue pick it already insulation staples? Why not?
(Why does this floor need liquid nails?)

Heat
Loss
Calculation
Fiberglass
Prefabrication.
ps. Osb I know is newest.