29 Dec '11, 12am

Payback between double- and triple-glazed windows?

Harry, The answer to your question will always be specific to an individual building at a particular site. It depends on the house specifications, house shape, and house orientation, as well as the climate, the local energy costs, and your assumptions about energy cost inflation. To perform the calculation, you need to run your proposed design through an energy modeling program. You'll need two iterations: one with the proposed double-glazed windows, and one with the triple-glazed windows. Comparing the two iterations, you'll learn how many BTUs you'll save each year with the triple-glazed windows. Many people have done such calculations. Using simple payback assumptions in New England, I've seen calculations that show that the triple-glazed windows aren't worth it. Others reach the opposite conclusion, but they probably assume higher rates of energy inflation than the des...

Full article: http://www.greenbuildingadvisor.com/community/forum/green...

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