From the building perspective, it is usually best to approach energy efficiency measures according to the appropriate site or building system. In addition, the greatest savings and performance are obtained through an integrated design process (particularly for new construction). Common areas of focus include:
- Site planning, landscaping & hardscaping
- Building envelope/shell (foundation, walls, and roof)
- Mechanical ( HVAC&R, water heating, pumping)
- Electrical (motors, transformers, etc.)
- Lighting
- Appliances
- Office equipment & plug loads
Further, for those projects that are considering the use of self-generation to cover all or a portion of the thermal and/or electrical loads of the home or business, it is always advised that the facility be made as efficient as possible prior to sizing and procurement of the self-generation system.
Projects should not only "meet" all applicable energy codes, but "exceed" them by using higher efficient systems or incorporate additional measures. Likewise, the owner and design team should consider related green building techniques and sustainabilty best practices to optimize the total energy and environmental life-cycle impacts of the project. Of particular importance is the opportunity to "do it right the first time" where it is difficult or economically prohibitive to alter the structure after it is constructed and occupied.
Typical Energy Savings by End-Use for Residential Include:
Typical Energy Savings by End-Use for Commercial Include:
This display shows three different types of insulation and how well they work to keep warm air in and cold air out. 
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