USGBC Updated LEED-AP-BD+C Exam Questions and Answers by winston

This is because:

A building automation system (BAS) is a system that controls and monitors various aspects of a building’s operation, such as lighting, heating, ventilation, air conditioning, security, fire alarm, and energy management1.

A BAS can allow programmable load control (PLC), which is the ability to adjust the power consumption of devices or equipment based on a schedule, a sensor, or an event2. PLC can help reduce the energy demand and cost of a building by optimizing the use of resources and avoiding unnecessary or wasteful consumption3.

The LEED AP BD+C V4 credit for Demand Response requires that buildings have a demand response program that can respond to changes in electricity prices or supply by reducing or shifting the demand for electricity4. A BAS can enable such a program by allowing PLC and other features that can modulate the power usage of devices or equipment in response to market signals or internal conditions.

Therefore, installing a BAS to allow PLC can help achieve the Energy and Atmosphere Credit for Demand Response by reducing the energy demand and cost of a building.

According to the U.S. Green Building Council (USGBC) and U.S. Department of Energy, buildings account for approximately 40% of total energy consumption in the United States.

This includes electricity, heating, and cooling loads across residential, commercial, and industrial buildings.

Buildings are the largest energy consumers, surpassing transportation and industry sectors.

LEED emphasizes energy efficiency to help reduce this 40% energy demand.

Buildings account for 40% of all energy consumption, making Option C the correct answer.

(Source: Official LEED BD+C Reference Manual)

Detailed Explanation:

In a cold climate, additional envelope insulation is the most effective strategy for reducing energy costs. Improved insulation minimizes heat loss through the building envelope, reducing the demand for heating systems. This aligns with LEED’s focus on enhancing energy efficiency and thermal performance in building design.

According to the LEED v4: Building Design + Construction Guide, the location of CO2 sensors in naturally ventilated spaces to comply with the Indoor Environmental Quality Prerequisite, Minimum Indoor Air Quality Performance is between 3 ft. and 6 ft. (1 m and 2 m) above the floor. This is one of the requirements for Option 2. Naturally Ventilated Spaces, which applies to projects that rely on natural ventilation for all or part of the occupied spaces. The CO2 sensors must be located in each zone with natural ventilation openings, and must be capable of generating an alarm when the CO2 concentration exceeds the design value1.

The other choices are not correct, because:

At least 6 ft. (2 m) above the floor is the location of CO2 sensors in mechanically ventilated spaces, not naturally ventilated spaces1.

At least 3 ft. (1 m) away from windows is a general guideline for locating CO2 sensors, but it does not specify the height above the floor2.

On the ceiling 3 ft. (1 m) away from adjacent walls is not a recommended location for CO2 sensors, as it may not reflect the actual CO2 concentration at the breathing zone of the occupants2.