Water Furnace Envision 4 ton dual capacity w/soft start. 2005 3700sq ft total ranch w/walkout basement. Loop is 3600ft of 3/4in. buried 6 and 3 feet deep 6 pipe arrangement in 2 trenches. Logging started Feb 17,2012 5pm local. Will use system to help dial in GLHP and monitor changes to house plus its pretty neat.