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INTRODUCTION: Energy efficiency is the percentage of total energy input into an energy conversion device or system that does work and is not converted to low quality useless heat. Being energy efficient helps the environment and helps reduce our reliability on renewable resources. Energy efficiency uses less energy and does more useful work. Although energy efficient devices costs more than least efficient devices but this pays off in the long term. Beginning with the most common thing in houses, lights, we can use fluorescent lights instead of incandescent lights which waste 95% of the energy input. Adding insulation to the house and windows can very much reduce waste energy. Another step to energy efficiency in houses is to plug leaks. People should also switch off electric appliances, lights, etc. when they are not using them. Using tankless water heaters, which only heat when needed, saves a lot more energy than...

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