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Do switchable sockets left "on" use electricity if there's nothing plugged in?

With nothing plugged into the power point, there is no closed circuit, i.e. no connection, so no current flow. Simple electrical theory...switch off, no closed circuit, thus no power flow. Unless, ...
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Is it more energy efficient to ventilate a home with an HRV/ERV or “shock-ventilation”?

The aim of intense ventilation ("stoßlüften") is to exchange air in a room efficiently. Generating a substantial draft ensures, ideally, that all corners of the room are ventilated. If you ...
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Biomass: Digestor/Reactor vs Gasifier Efficiency

Your comparing apples to oranges, or rather apple fruits to apple trees. AD (Anaerobic digestion) can only use parts of the plants that a cow could eat - starch, fat, protein and some fibre (...
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Why not use condensate from a split-unit air conditioner to improve cooling efficiency?

I considered a water drip on my outside condenser but the possibility of corrosion was likely to more than offset any efficiency gain. Yes, the outside unit gets rained on occasionally but that is not ...
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Why not use condensate from a split-unit air conditioner to improve cooling efficiency?

Yes, indeed, all AC units have condensing water on the evaporator. One way to get rid of it is simply a pipe where it is discarded to a sewer or discarded outdoors. In units that are not designed to ...
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