We are in the planning stages of building a new home with partial walkout basement using Superior Walls (precast concrete). Should I bring the loop in through the wall or under the slab and come up somewhere close to where unit will be placed? Pro's and Con's of either location? Currently have a geothermal system (4ton) on open loop which works great for last 19 years. Uncertain on installing another open loop system within 300 feet of current home (building new home on adjactent property). Never had a problem with open loop before. New home will be around 3,700 sq feet with sprayfoam insulation, high quality windows and doors. Located in Southern Va. Haven't sized a new system yet, just planning for now. Any comments?? Thanks for any info.