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I'm making one - not at the moment of course, not worth it in the middle of winter - but I have a box painted black, with holes cut in the top and bottom covered with insect screen, shelves from an oven which I'm going to cover with insect screen, and a piece of perspex for the front. It'll sit in the conservatory which gets full sun. Cheap and very low energy, made from free bits of stuff.

A thread is never dead! :-)

Last autumn we lived in a house with a small apple orchard (just for the for one harvest season). My Stöckli has been running overtime during those weeks and I had a whole lot (!) of dried apples. I learned how to use them and it was certainly cheaper to dehydrate the apples ourselves than purchase dehydrated apples from the stores. However, it is still quite a bit of energy use... I forgot exactly what our electricity measurements turned up, unfortunately.

Yes the Stockli is excellent, very quiet. I recommend the metal trays, and buy a few extras at the same time