Thank you Daox ,
I was thinking about placing a spiral of 'mains water filled black piping' down the bore hole (ie 25 meters deep). this would be a lot of tube but I was wondering if that would guarantee the coolest circulating water and remove any problem of rust and eliminate any risk of fouling another aquifer.
I would then need to consider the cheapest (ie as in cost of running) pump to cause this water to circulate.
I have also considered insulating the above ground pipe to prevent heating of the circulating water .
The next step might be to use a number of old computer fans to push air through a coil of black pipe into my selected rooms beside my existing ducted heating.
What do you think?
regards
David
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