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lucid

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lucid

Optimum settings for efficient use of energy

A church service begins at 11.00am and finishes at noon. At what time should a heating timer be set to come on at and switch off, ensuring the minmum waste of residual heat at the end of the service...
11:05 Mon 21st Dec 20096 answers, last by tamborine 04:37 Wed 23rd Dec 2009

Only 1 question