Thanks for the info Geoff.
I have a large Pavillion in my back yard. It is open on four sides. It is also cool as I set the concrete foundations 2 to 3 feet below ground. I plan to place a grid of pvc pipes under my dining table. Then with water from my bore circulating I will blow air (with some solar powered fans) through . This will be great in summer. In winter I will run hot water that I will soon be collecting from my garage roof. This will help me warm some of my cacti and succulent plantsd through winter.
Any suggestions?
Regards
David
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