Yesterday I posted a question about soil conditions and the concerns I had with Shale. It was answered that Shale,especially moist shale is suitable. So once that was realized I moved on and did my heat gain and loss calculations on my home. (again I am an hvac contractor but know very little about geothermal) Anyhow my calculations came out to be about 3.2 tons of cooling and around 96k btu heating. (I currently have a modulating propane furnace with a 3.5 ton heat-pump.) The next step was suggested to me this morning by a member that I use climate masters free software to design my loop field. However it will not allow me to download the software. (it says some error occurred) Can anyone please steer me in the right direction for designing a horizontal loop field? I find the slinky method interesting. Any other information needed please let me know. I greatly appreciate the help. Located in eastern Ohio. Have plenty of space to do whatever. Just need to know what to do and why. Thanks!!