Massachusetts Institute of Technology

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Passive Solar Stages a Comeback

Others say that solar is dead, but Harris Hyman is convinced it's on the rebound. Energy-efficient window glazings are mak- ing the difference, he says. More

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The Case of the Disappearing R-Value

Manufacturers have long claimed that the higher R-value of urethane and polyisocyanurate more than compensates for their higher cost. But research now indicates that even the so-called "aged" R-value of these products is lower than previously believ More

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Focus on Energy: What to Look For in Energy-Efficient Windows

Energy-efficient windows. More

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