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How does the greenhouse heat sink work?Some details are in the book, but half the adventure is working out for yourself and thereby customising you solution. All you need is:The heat sink is imploded glass - we used bottles from various parties and the local pub - imploded courtesy of Krysteline www.krysteline.net Big hole - we lined it with polystyrene that came as packagingPipes were standard waste pipes for under sinks etcFan was a small 12V computer fan from a market £1.20 - in a box made of scrap woodA 12V deep cycle leisure batterySmall 11w solar panel and charge controllerOld chimney cowl for the air to be pushed out the glassAir sucked down from the apex heats the broken glass under the floor. Fan runs 24 hours a day. As the greenhouse cools the cooler air is still pumped through the glass, but when it comes out through the cowl, at floor level, the glass has warmed it so a constant supply of warm air is now being pumped through.