Blank canvas, steel sided 40x60 pole barn. Thoughts on insulating, electrical, heating???

67Dart273 said
It's already too late. You should have sunk a pair of in floor heating coils in the thing.......liquid heating, a coil to use and a coil for spare, or use both and block off one if it ever failed

Floor is not poured. Still dirt. I'm not sure what you mean though, the pex water lines? Or something else?