The house is an icf radient floor new construction, zone 5 spokane wa. Manual j 50,000 btu at 20 degrees. We have 10 acres of sand. I can squeeze a ball of sand and it will stay in a ball, poke it with my finger and it will break into. My question is can a ground loop be reasonable designed or sould I abandon water to water and go with air to water and a lp backup boiler.

It is a balance of cost, function, and look.

FYI heated floors don't require as much heat to keep a house warm in a supper efficient house as they used to so they are not going to feel as warm. But I currently also use the floor to cool the house by running sprinkler water through the floor in summer.

If you don't mind out side air handlers use air to water, if you don't want anything visible and can afford extra cost then go Geo.

I also have a icf shop with an apartment heated floor but with a hot water heater. I know not very efficient but I want to get a feel for radient, awesome heat. What was recommended was 7' down 800' of pipe terminated in the garage. I have access to a trackhoe with a 60" clean up bucket. I'm strongly considering a 6 ton field, 6 loops.

I also have a icf shop with an apartment heated floor but with a hot water heater. I know not very efficient but I want to get a feel for radient, awesome heat. What was recommended was 7' down 800' of pipe terminated in the garage. I have access to a trackhoe with a 60" clean up bucket. I'm strongly considering a 6 ton field, 6 loops.