Providing occupant comfort controls can add some costs, but they can also save money and improve occupant comfort and productivity. Occupant comfort controls allow for the mechanical system to respond to conditions specific to different parts of the building, improving overall comfort while saving energy. Typically, a system under central control is sized and calibrated for the least comfortable space. For example, in cooling season overhead air conditioning is provided for the warmest space, while everyone else under the same AHU feels uncomfortably cold.

The comfort system does not have to be especially expensive or complex. It may simply be, for example, localized air conditioning with occupant controls. 

The required comfort control has to address only one of the four primary comfort criteria identified by ASHRAE 55-2004: air temperature, radiant temperature, humidity or air speed. You may address multiple criteria, but aren’t required to do so.

Some conventional systems typically rely on central control, and multiple controls may be difficult to incorporate. Underfloor air distribution, on the other hand, is designed for flexibility and individual control in a way that naturally supports this credit. 

Including operable windows in the building can reduce dependence on specific mechanical system designs. Positioning as many occupant spaces near operable windows as possible can make this credit easier to achieve.

Assess your climate and your ability to provide occupant-controlled interventions for different comfort criteria. These may include: 

operable windows for air speed and temperature
air conditioning for temperature and humidity 
ceiling fans for air speed
desiccant dehumidification 
radiators for air temperature
air diffusers for air speed.

Desk fans are not considered an acceptable strategy according to LEED Interpretation #1722, although USGBC has not officailly applied that Interpretation to LEED-2009 rating systems.

Early during pre-design the owner identifies occupant comfort and control goals in the Owner's Project Requirements for commissioning in EAp1 and EAc3.

After two years, consider continuing to pay for green power. Doing so can help projects that are pursuing LEED-EBOM certification via EAc4.

If you do not purchase two years of green power at occupancy, you will need to continue to pay monthly or yearly for two years. 

Submit documentation to LEED Online. This will include filling out the LEED Online credit form, which requires a number of inputs on total electrical consumption (or default values) and details on the green power purchased. You will also need to upload a proof of purchase for two years of green power—see the Documentation Toolkit for an example.