Thanks Poconos. The $1,800 was made up of approx. $750.00 to dig the trench and the remainder for the propane co. to lay the pipe and price of materials. Yes, code in my town requires 18" trench, backfilled with suitable sand/pea gravel. Likely, a lot of rocks to contend with in digging the trench. Besides the long run, there is also a significant elevation change as the pool area is terraced below with RR tie retaining wall. I believe this also requires certain "modifications" in piping dimension. I am hoping to be comfortable going with the Heat Pump, but waiting to see how people respond to post.