Energy demand in buildings depends largely on the climate where it is located. Lighting typically consumes 30-50 percent of electric demand. Heating and air conditioning varies by region, but can consume 20-40 percent of energy (gas, electric, and oil). Office equipment typically consumes 25 percent of the electric bill. Demand can be reduced by scheduled off or setback periods, peak demand monitoring and load shedding, the use of drives and by applying hundreds of control techniques that are specific to the equipment being controlled.   _{Your Comment}