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Which of the following statements does not represent a type of energy efficiency? a) a house’s outer walls and rood are properly insulated

b) cars consume less gas when the vehicle is increased in weight and sturdiness

c) heat and power are cogenerated

d) timed thermostats are installed to reduce energy at night

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i’m pretty sure the answer is c or d but i cant figure out which one, this is a timed quiz too :(

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