Being energy efficient can save you money, increase your reliability, and protect the environment.
A qualification of electrical products, in which they achieve an appropriate ratio of energy usage to work-type output. For example, an energy efficient light bulb will use most of the input electrical energy to produce light, not heat.
description of a property which has special features aimed at reducing use of electrical or heating power (i.e. insulation, double-insulated windows, high-efficiency furnace, etc.).
Not wasting electricity. Energy efficient devices do work using smaller amounts of electricity, which costs less.
Window treatments that keep out summer heat winter cold, reducing heat or air conditioning needs.
As applied to buildings, generally indicating the existence of extra insulation, weatherproofing, and/or special features and equipment designed to reduce the cost of energy for heating, cooling and hot water.
A property that has features that use energy (heat and electricity) in efficient levels.