Looks good Azfishkid, simple and effective.
I'm pretty sure Koi can go from freezing temps(if deep enough) to near 100 degree water, as long as it isn't for tooooo long. I've got my pond under 2 or 3 large trees for cover as well. Usually stays around mid 70s or so.
125g semi planted. 2 silver angels, 14 silver tips, 16 white fin ornatus tetras, pair of Nicaraguense, pair of nototus severums, trio of firemouth cichlids. 2 FX5s, 1 1500gph circ pump, 2 48" LED lighs, and a HUGE piece of driftwood.
650g fish room. 15 30g tanks, 150g sump.