I am a horizontal directional driller and do a fair amount of work installing horizontal loop fields for local HVAC contractors. Typically we use a 300' shot (600' total pipe) per 1.5 tons at an average depth of 15-18' using 3/4" pipe that are 10' apart and then depending on the size of the job use either 1.25" or 2" from the manifold to the building. I am doing a large job on a medium sized site and am considering increasing the size of the pipe in the loops to 1" or even 1.25". Can anyone tell me how that would impact the total amount of pipe needed? The total job requires 35 tons.