I live in SE PA, and have worked with a half a dozen or so well contractors over the years. Never has one drilled a hole more than 300 feet for a geothermal system. Even in houses with 25-35 tons of heating/cooling. The main reason why is because you will chew up flow centers quicker and the horizontal tubing counts as vertical bore feet. So its a little less drilling up front. I suppose if you have one system and only one flow center a deep well will work, but it will be tough on those pumps. Generally you need about 160 bore feet per ton.
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" Is wearing a helmet illegal" Mike Kerr 1-29-09
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