The more I hear about geothermal the more i wonder at what point it becomes cost effective enough that it becomes more common. That said, would there be any real wold efficiency gained by low end geothermal booster for home systems. Here is an example of what I am thinking.
Picture any regular home AC unit. Outdoor condenser. Would it be possible to appreciable increase its efficiency using a externally attached coil, think attached in a similar means as an after market transmission cooler is on a car ( http://imgur.com/a/hGWSU ) only much larger. Connected to that are hoses leading to a low cost geothermal heat exchanger. I dont know anything about this end of it, so lets start with something that should be easy to create in most yards, say some sort of tubular exchange set in a 4' wide by 12' long by 2' deep trench, recovered by earth. Using some fluid thats environmentally safe with low corrosion properties.
Would something like this be cost effective at all?
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