Insulating Paints No Miracle Energy Saver

Do insulating paints actually insulate and save energy? If they do, are they environmentally friendly to use? — Bob Dibrindisi, Easthampton, MA

Paint additives that claim insulating qualities have been marketed since the late 1990s, but energy research organizations have not confirmed their insulating value. For its part, the U.S. Environmental Protection Agency (EPA) does not recommend using paints or coatings in place of traditional bulk insulation. “We havent seen any independent studies that can verify their insulating qualities,” the agency reports. The federal government does rate roofing paint for its energy efficiency, but such findings only take into account a substances ability to reflect heat off the roof-not its insulating properties per se-to keep the building cooler.

According to the Department of Energys Oak Ridge National Laboratory, the use of so-called insulated paints is in most cases “difficult to justify on the basis of savings in energy costs alone.” Meanwhile, the non-profit EnergyIdeas Clearinghouse, a partnership between Washington State University and the nonprofit Northwest Energy Efficiency Alliance, found that under ideal circumstances insulating paints can achieve a “reduction in heat gain” of around 20 percent on freshly-painted sun-exposed walls, but notes that such walls will only face direct sunlight for a limited part of even the clearest summer day. Also, the clearinghouse reports that “heat gain reductions…are significant only for sun-bathed surfaces” and that the “reflectivity of the painted surface generally declines considerably with time.”

Alex Wilson of the website BuildingGreen.com is not a fan of insulating paints: “To say that there is a lot of hype about insulating paints…is an understatement,” he tells the website Treehugger.com. “The Internet is rife with claims of paints that dramatically reduce heat transfer-usually based on some technological magic spun off from NASA. While these products may have some relevance in the extreme conditions of outer space, manufacturers of paints containing [insulating additives] are making claims that defy the laws of physics…when they claim they can save significant energy in buildings.”

Nevertheless, for certain applications, especially in concert with traditional forms of insulation underneath, insulating paint can help reduce energy expenditures and air conditioning bills accordingly. For those who want to forge ahead with insulating paint despite the limited benefits, some of the leading brands to look for include Insuladd, Hy-Tech, Therma-Guard and Eagle Coatings SuperTherm.

Adding insulating paint should merely be the icing on the cake of an otherwise well-conceived plan to cut heating and cooling costs. Installing a traditional form of insulation would be the first defense. A reflective, radiant barrier on the roof structure in the attic also could offer significant help, according to the Florida Solar Energy Center. Thermal-pane windows and energy-conscious practices will contribute to the effort. Finally, consider trees and other landscape shading, which the U.S. Department of Energy recommends as an effective way of passively cooling your home. For more ideas, visit the “do-it-yourself energy audit tool” on the Lawrence Berkeley National Laboratorys Home Energy Saver website.

CONTACTS: U.S. EPA, www.epa.gov; EnergyIdeas Clearinghouse, www.energyideas.org; Insuladd, www.insuladd.com, Hy-Tech, www.hytechsales.com; Eagle Coatings, www.eaglecoatings.net; Therma-Guard, www.befreetech.com/thermaguard.htm; Home Energy Saver, www.hes.lbl.gov.

EarthTalkTM
From the Editors of E/The Environmental Magazine
SEND YOUR ENVIRONMENTAL QUESTIONS TO: EarthTalk, P.O. Box 5098, Westport, CT 06881; earthtalk@emagazine.com.

Solar Power Can Serve Entire Neighborhoods

I know of solar power systems that people can put on their roofs to generate electricity or heat water. Are there systems that serve whole neighborhoods? — Lee Helscel, via email

Collective bargaining is a good strategy when looking to get the best price on a given product or service. Solar power is no exception, and dozens of neighborhood-wide installations in the U.S. and Canada have created a new model whereby going solar can actually start to pencil out for individual homeowners.

One of the first neighborhood-wide solar installations in the world was at the master-planned community of Drake Landing in the town of Okotoks in Alberta, Canada. The entire community, now with more than 50 homes built and occupied, is heated by a neighborhood-wide “borehole thermal energy” system designed to store abundant solar energy underground during the summer and distribute it to each home as needed for space heating throughout the winter. The system, which launched in June 2007, now fulfills some 90 percent of each homes space heating needs, with any slack taken up by fossil fuels.

While some planned communities like Drake Landing incorporated neighborhood solar power from the get-go, others decided it made sense after they were first built. One example is the deal that homeowners in Marin County, California can get in on, thanks to the hard work of the nonprofit GoSolarMarin. The group negotiated discounted group rates with several photovoltaic solar panel providers, and eventually signed on with SolarCity, a Silicon Valley based solar provider that operates some 30 different “community solar programs” across California, Arizona and Oregon.

GoSolarMarin was able to negotiate a rate some 25 percent lower than what a typical solar installation would cost for Marin County residents willing to participate. And best of all, homeowners can lease from SolarCity instead of having to pay tens of thousands of dollars out of pocket to buy equipment that may become obsolete in a few years. SolarCity monitors all clients installations online to ensure that they are running at peak performance, and also makes house calls for maintenance as needed.

While California is no doubt a leader in residential solar power, the concept is spreading. Neighborhood Solar, for instance, is a Colorado-based nonprofit formed to accelerate the adoption of residential solar power in the Denver Metro area. The group organizes homeowners into collective solar purchasing groups, and negotiates significant discounts accordingly. “We act as an independent buyers agent,” the group reports on its website, “with the goal of providing the best value to residential solar purchasers while helping installers put up more solar at reduced overhead costs.”

Community-based groups like GoSolarMarin and Neighborhood Solar are springing up all over the country, and dozens of solar companies have now adopted the community installation model. Community leaders interested in neighborhood-scope solar programs should shop around for the best prices and service guarantees before signing with any one solar provider. Theres a lot individuals can do to be part of clean energy solutions; theres even more a group working in concert can accomplish, and community-based solar is but one bright and shining example.

CONTACTS: Drake Landing Solar Community, www.dlsc.ca; GoSolarMarin, www.gosolarmarin.com; SolarCity, www.solarcity.com; Neighborhood Solar, www.neighborlysolar.com.

EarthTalkTM
From the Editors of E/The Environmental Magazine
SEND YOUR ENVIRONMENTAL QUESTIONS TO: EarthTalk, P.O. Box 5098, Westport, CT 06881; earthtalk@emagazine.com.