I building my new home on a 4 acre lot. The house will set up on the highest point on the lot. We don't want to bore and or trench, but we were thinking placing lines behind our retaining walls. The walls will be built and then back filled and we thought it would be perfect time to bury the lines to the heat pump. Will this work? Building a single story slab on grade. Radiant heating and cooling for a 2200 sq/foot house. Full sun all day long 1450 plus elevation. Atascadero, CA Refer to the attachment for a visual explanation. Please feel free to comment with your Pro's, Con's or other questions. Thanks for your review.