Picture this: the doorbell rings and you aren’t expecting visitors.There’s a bright eyed boy standing outside with ‘salesman’ written all over him. Thank goodness, you don’t see any of the outward signs of the zealous evangelist. No short sleeved white shirt with a name tag, no brochure-laden black rucksack. Besides, they always travel in pairs. Curiosity finally gets the better of you. He tells you he’s here to talk about your energy use. …

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