Well, my system was up and running though August 2013 and the temp stayed between 78 - 82. The FT is on the east side of my GBs and receives morning sun up to noon before the shade from the trees give them afternoon protection. Being in the ground and shaded in the afternoon, plus I have two umbrella stands build into the east and west side of the FT. I seemed to work out all right...trees can be trimmed or let grow as needed.

On my organic garden that I built before learning about AP, runs with a shade screen (50% shade) all year round on just the west half of garden area. Plants seem to do fine all year round with out removing the shade screen.

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I HAVE NOT FAILED. I'VE JUST FOUND 10,000 WAYS THAT WON'T WORK. Thomas A Edison