On Sat, 01 May 2010 08:49:33 +0100, The Other Mike
wrote:


Thinking that a green roof might be a reasonably cheap option with
climbers like ivy up the exposed sides. But that still leaves the
doors that face due south and soak up masses of heat.

Suggest fit the pvc box section as suggested earlier, but mounted on
battens to leave as much air gap as poss, and room at the bottom for
air to get in. Oh, and paint everything brilliant white.