I am new to this site. I need advise on installing Geo Heating and Cooling. I have a pond that is 250 feet from my house 325 feet to the center of pond from house. The pond is 25yrs old. When it was dug originally it was 16 feet deep with water level around 14 to15 feet deep. Now it averages 10 to 12 feet deep and is maintainning that level except during dry spells. This year being one of them dry spells. It was down 2 feet as of last fall. It has come back up some because of winter snow and rain. The contractor that dug the pond told me it would be consider a half acre pond (small half acre). I have had 3 contractors give estimates on installing Waterfurnace Geo systems. they all vary on how they would install the loops. 1st contractor said he would not advise using pond said it was not big enough. He would install ground loops with backhoe tearring up most of my backyard with 3 different loop fields. 2nd contractor wants to use a pond loop and also use the 250 ft trenche as part of the system. 3rd contractor would use what is called a directional horizontal bore machine installing 3 seperate horizontal loops in the ground of at least 150 to 200 feet apiece. these contractors come highly recommended from their respective customers. My question is, Which loop would be avisiable to use. Any help would be greatly appeciated. Also my house is 1900 square feet one level.