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Energy efficiency is reducing the amount of energy used, by using less energy to provide the same service. For example, LED lights use a lot less energy than incandescent light bulbs, which produce the same amount of light.
•Dark tiles on roof absorb heat from the sun and heat the house. we used thin cardboard to represent this for the house.
•Solar panels (used for the top of the roof). Absorb heat from the sun and uses it as a source for energy to generate electricity. we used shiny black thin cardboard and white-out to represent this in the house.
Insulation in the roof (bats), help stop heat escaping through the roof and ceiling.