Demand-controlled ventilation (DCV) is a control strategy that varies the amount of ventilation outside air delivered to a space based on input from a single carbon dioxide (CO2) sensor or group of sensors.

On a sunny summer day, a typical roof surface can reach temperatures that are nearly 100°F above the ambient temperature. A cool roof, by contrast, stays at or near the ambient temperature due to the characteristics of its outer layer.

With so many factors influencing glazing selections, whole-building lifecycle analysis is the best tool for determining the most costeffective solution. Few decisions that a designer makes have more impact on the appearance and utility of a building than the glazing selection.

Using building integrated photovoltaic technology, design teams may supply solar energy to building systems, integrate the technology seamlessly into the building design, and provide an economical renewable energy source for building owners.

Radiant cooling systems are more efficient, more comfortable, more attractive, and more healthful than systems that circulate air. Unlike most cooling systems in California, which circulate cold air to maintain comfort, most radiant cooling systems circulate cool water through ceiling, wall, or floor panels. "Coolth" from that water is then absorbed by occupants and interior spaces according to the dynamics of thermal radiation.

A 35-foot tall "water tower" feature dominates both the exterior and interior of the single-story Victor Valley Water District Administrative Facility. Located in a high desert climate, this building has 12-inch-thick exterior walls with solid-grouted concrete masonry.

By understanding climatic conditions that are specific to a project's location, design teams are able to develop climate responsive building designs. The result is a building that utilizes less energy and provides a high quality and comfortable environment for the occupants.

Using the integrated energy design approach, designers can cost-effectively lower building operating costs while improving workers' comfort and boosting productivity.

Heading into what promises to be a long, hot California summer, most people are putting their thick outerwear into storage. But it's important to remember that for commercial buildings, an airtight covering of insulation saves on energy costs by fending off heat transfer from the hot outdoors and by keeping conditioned air from leaking out.

Communities around the Mediterranean have used them for many centuries . . . and in modern times building researchers are quantifying their benefits. Now California's new Title 24 standards offer credit for them-It's time to take another look at cool, reflective roofs that can improve our communities and the environment in the future.