Hot Tip

Although daylight and occupancy sensors help to keep energy costs low, they cannot be used in calculations for lighting power density.

Check Section 9.6.2 for potential additional allowances for decorative or display lighting. This additional power density is a function of the type of merchandise and the space area. 

The documentation for the performance approach is the same as for EAc1.3: Optimize Energy Performance—HVAC, Option 2 – Energy Cost Reduction, 15-30%. 

Work on an energy model typically takes three to four weeks before it can provide reasonable results and recommendations, so be sure to start this early in design development. 

The compliance forms are not required by LEED Online, but it is a good practice to complete them during design development to use as a checklist for the project team and keep them until the project receives LEED certification. 

All ASHRAE compliance forms should be completed during the design phase to track status and compliance whenever changes are made. 

“Rated power” refers to the maximum amount of power that can be drawn by a piece of equipment at any given time. Be sure to use this for each appliance and piece of equipment to be consistent in your documentation.

LEED only refers to ASHRAE 90.1-2007, Sections 9.4 and 9.5. Other sections are not applicable to LEED certification requirements. 

Research the exemptions in ASHRAE 90.1-2007, Section 9.2.2.3. Many types of performance and high-powered performance lighting (such theatrical lights) are exempt from the calculations. Refer to the additional lighting allowances for artwork, decorative lighting, and display lighting listed in Section 9.6.2. 

In a remodeling project, if new lighting is replacing less than 50% of the total installed wattage, the project is exempt from reducing LPD 10% from the ASHRAE 90.1-2007 standard. However, you still must comply with all mandatory requirements for controls and wiring.