الفهرس 
Title
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Abstract
The rapid growth in populations and energy demands has become one of the major problems that every country is facing right now from the richest countries to the third world countries, one of the consuming domains for energy is the existing buildings sector and its rising number, along with the building construction and its operation which contribute to a significant potion in global energy consumption and greenhouse gas emissions. Therefore fast enhancement for building energy efficiency is crucial for a timely reduction in global energy use and endorsement of environmental sustainability. This research discuss the energy consumption reduction potential and opportunities in every existing office building as well as the most effective retrofitting applications that can be used for greenhouse gas emission reduction along with the energy reduction. Dividing the retrofitting approaches into three levels as per the energy reduction percentage from the operation and maintenance needed for reaching 10% total energy reduction to deep retrofit level that can reach 60% total energy reduction