Question

gain knowledge about ancient practice to increase energy efficiency

Answer 1

Energy efficiency or efficient energy use is the goal to reduce the amount of energy required to provide products and services. For instance :

If a single pane window in the house is replaced with an energy efficient one, the new window will prevent heat from escaping in the winter and save energy by using the furnace or electric heater less while still maintaining a comfortable temperature. In summer, efficient windows keep the heat out, so the air conditioner does not have to run as often and electricity is saved.

Using a clothesline to dry clothes instead of a dryer.

Energy efficiency can enhance human health by reducing the greenhouse gas emissions, improving outdoor air quality and decreasing acid rain.