Brian and Jacqueline Potzkai potzkai at hotmail.com
Thu Dec 6 12:50:05 EST 2001

>Could a grower install a hydronic heating system in the floor of a tunnel? 
>A hydronic system forces heated water through a tubing system buried in the 
>floor, heating the floor.

I believe the University of BC used this method in combination with solar 
panels and a covered rock floor - energy from solar panels were used to 
create heat that was in turn captured by the rocks - heat would release 
throughout the night.  Jacqueline

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