Mold in a vented attic.

What's moisture have to with energy? Quite a bit, actually. When we tighten up or insulate a house, there's the potential of causing moisture problems that could harm your health by allowing mold to grow or affect the life of materials your house is built from. And any time you work on a house, especially when you do things that affect the exterior envelope (walls, roof, foundation), you're provided with an opportunity to fix problems that may already exist.

I spent a few days last week at the University of Massachusetts–Amherst, attending the 2008 Wood Structures Symposium. Like many smaller conferences, it was pretty invigorating, with conversations from sessions spilling into the hallway coffee breaks. The theme this year was prefabricated architecture, a particular interest of mine, and there were lots of new ideas floating around.

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Plant engineer Henrik Mattsson showing off the chip sorting facility at the Brattleboro CHP plant.

Last week, I addressed some of the benefits of capturing waste heat from power plants and distributing it to buildings--a technology referred to as combined heat and power or CHP. This week we'll look at how this idea could be implemented in Brattleboro--using sustainably produced wood chips as the fuel source.

Louis Palmer and the Solartaxi
Does prefabrication make green houses more affordable? I asked this question almost a year ago when I was working on a feature article on the topic. Back then the answer was "not quite yet."

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The reactor at the Vermont Yankee nuclear power plant in Vernon, Vermont.
Plastics — chemical compounds which are compressed under heat into desired shapes, and thereafter are not subject to corrosion — are increasingly in use. Some are made of coal-tar products, some of milk; and one... utilizes the Chinese soy bean. This useful plant, is, next to rice, the staff of life in the Celestial republic; like beans, peas, and other "legume" plants, it contains the proteins, or nitrogen compounds, for which we eat meat.
> A $250/cord of firewood burned in an EPA-compliant wood stove (70% efficient) provides just $16.23 per million Btu of delivered heat.

While energy prices have dropped from their record highs a few months ago, many area residents are still wondering how they'll pay for heat this winter. The most common fuel in northern New England, heating oil, is still priced at over $4.00 per gallon.

Today the Department of Energy's Building Technologies Program launched the Zero Energy Buildings Database with an offering of three Zero Energy Buildings (ZEBs) and one near-ZEB. A lot of work has been put into defining ZEBs and you can learn about the different types at the Net ZEB page.

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Maverick NYC mechanical systems designer Henry Gifford has long been a critic of LEED, arguing that it encourages the wrong things, and doesn't go far enough to ensure that certified buildings really save energy or provide good air quality. I have great respect for Gifford and the work he does to design and commission low-energy buildings with great ventilation on very tight budgets. Unlike too many practicing engineers, he knows exactly how much energy his buildings are using.

I was down in Orlando last week — land of asphalt, ChemLawns, and Mickey Mouse. As is typical in that part of the world, it was too hot outside and too cold inside. In one of the mammoth Disney hotels, I was participating for two days in the Tenth Anniversary Annual Meeting of an organization called FLASH. FLASH is the Federal Alliance for Safe Homes — it used to be the Florida Alliance for Safe Homes, which explains the "L."