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Limits the amount of air exchanged

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Find the most efficient tech that heats the water

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Changes room temp. depending on time of day or human activity

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No air can escape

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All machines are on human power alone, no electronic treadmills or stair climbers

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Like LEDs and such

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Increasing water pressure in showers/sinks will decrease how long they're used

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Lights in rooms have motion sensors on doors to tell if anyone is in the room or not, or similiar systems.

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Large windows placed to trap heat from the sun, curtains when it would make rooms too hot.

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convert water leaving through the pipes into energy by spinning the wheels

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Extracted from water (technology is in early stages)

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Take thermal energy from underground to heat the building

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wind power

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Thermo-insulative material in the walls and roof to contain heat.

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Using waste

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Vegetation on top of building

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Hydro energy

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Solar energy