29 Dec 2008:
Germany Builds Houses
That Use Almost No Energy to Heat
Architects in Germany and other countries are designing “passive houses” that have extra-thick insulation and special windows and doors
so almost no heat escapes and almost no cold seeps in. This design allows the homes to be warmed not just by the sun, but also by the heat from appliances and
An original "passive
house" in Darmstadt
from residents’ bodies. So far, the New York Times
reports, an estimated 15,000 passive houses have been built worldwide, most of them in Germany and Scandinavia. Earlier attempts at building sealed solar-heated homes failed because of stagnant air and mold. But passive houses use a central ventilation system that allows warm air going out to pass alongside clean, cold air coming in, allowing heat to be exchanged with 90 percent efficiency. “The myth before was that to be warm you had to have heating,” says Wolfgang Hasper, an engineer at the Passivhaus Institut outside Frankfurt. “Our goal is to create a warm house without energy demand.”
Yale Environment 360 is
a publication of the
Yale School of Forestry
& Environmental Studies
Yale Environment 360
articles are now available in Spanish and Portuguese on Universia
, the online educational network. Visit the site.
Business & Innovation
Policy & Politics
Pollution & Health
Science & Technology
Antarctica and the Arctic
Central & South America
The 2015 Yale e360 Video Contest winner documents a Northeastern town's bitter battle over a wind farm. Watch the video.
is now available for mobile devices at e360.yale.edu/mobile
A 2015 Yale e360 Video Contest winner captures stunning images of wild salmon runs in Alaska. Watch the video.
video goes onto the front lines with Colorado firefighters confronting deadly blazes fueled by a hotter, drier climate. Watch the video.
A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.
Top Image: aerial view of Iceland
. © Google & TerraMetrics.