The most recent blogs at Green Building Advisor

Saving Energy With Manual J and Manual D

Posted on August 13, 2010 by Martin Holladay, GBA Advisor in Musings of an Energy Nerd

If you’ve been paying attention to energy-efficiency experts and green-building Web sites, you probably know that it’s important to properly size your HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. equipment. Most sources repeat the same advice: oversized furnaces and air conditioners cost too much, waste energy, and sometimes provide lower levels of comfort.

When is a Window Upgrade Worth the Extra Cost?

Posted on August 12, 2010 by Scott Gibson in Q&A Spotlight

There's no doubt that windows are getting better — much better. The double-glazed, low-eLow-emissivity coating. Very thin metallic coating on glass or plastic window glazing that permits most of the sun’s short-wave (light) radiation to enter, while blocking up to 90% of the long-wave (heat) radiation. Low-e coatings boost a window’s R-value and reduce its U-factor. units that looked so ground-breaking a few years ago seem merely ordinary now that Canadian, European and some U.S. manufacturers are producing high quality triple-glazed units.

Triple-glazed windows offer substantial benefits, including improved indoor comfort and lower energy bills.

But they aren't cheap. Homeowners who are already facing painfully high building costs have to weigh the costs against the benefits. Are triple-glazed windows really worth the added cost?

Are Energy-Efficient Appliances Worth It?

Posted on August 12, 2010 by Peter Yost in Green Communities

When homes turn over, is it green to automatically turn over all of the major appliances as well? The answer is likely to be yes. Unlike many other goods, major appliances in the US over the last 20 years have gone way UP in energy efficiency while going DOWN in price. Research by the Lawrence Berkeley National Laboratories shows that between 1980 and 2001, the energy efficiency of refrigerators and freezers improved by about 60% while at the same time real consumer prices dropped by 40%!

Building to LEED and NGBS Green Certification in One House

Posted on August 10, 2010 by Danny Kelly in Guest Blogs

We had already walked and jogged on our journey to green, but we began to worry that we would miss out on our chance to run. We had a pretty good reputation as one of the few builders in town familiar with green building, but the real estate market was headed down, so we weren’t building any more spec homes. We introduced all of our new customers to a range of green building programs, but none of them were very interested.

Back to the classroom

Driving to Maximize Your Fuel Economy

Posted on August 10, 2010 by Alex Wilson in Energy Solutions

In this column I usually focus on how to save energy in our homes and businesses, but for many of us, getting around is our largest energy consumer—particularly in the summer months when we’re not heating our houses. Some of us are lucky enough to have hybrid cars, and this gives us a head start in saving transportation energy. I just calculated that the 2003 Honda Civic Hybrid we own, which averages about 40 miles per gallon (mpg) year-round, has saved us about 2,800 gallons of gas over the 146,000 miles we’ve driven it (compared with a car getting the U.S.

My 7th Commandment: You Can Run, But You Can’t Hide

Posted on August 9, 2010 by Michael Strong, LEED Associate, CGP in Business Advisor

If you think I look silly in the adjacent photo, I am here to warn you that thermographic imagery will make us all look silly if we do not take stock of the power it holds in the hands of homeowners. In the next two to three years, it will change the way we all look—and the way our houses are built—more than ANY other technology to hit our industry since power tools.

Deep Energy Retrofit: Apply the Energy Efficiency Pyramid

Posted on August 6, 2010 by Christopher Briley in Green Architects' Lounge

This is the last installment in the Green Architects' Lounge trilogy on deep energy retrofits.

In this episode, Phil and I discuss the importance of sizing your new HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. system to the heat load of your newly renovated house. (This is where that energy auditEnergy audit that also includes inspections and tests to assess moisture flow, combustion safety, thermal comfort, indoor air quality, and durability. information, which we mentioned in previous episodes, is going to come in handy.)

Sealing Ducts: What’s Better, Tape or Mastic?

Posted on August 6, 2010 by Martin Holladay, GBA Advisor in Musings of an Energy Nerd

Most residential duct systems have numerous leaks that waste energy and lead to room-to-room pressure imbalances. Unfortunately, though, few building inspectors outside of California bother to enforce existing code requirements that residential duct seams be sealed with mastic or high-quality duct tape.

Westford Building Science Symposium Raises Some Interesting Questions

Posted on August 5, 2010 by Carl Seville, GBA Advisor in Green Building Curmudgeon

Much of the GBA team was in attendance at the 14th-annual Westford Building Science Symposium last week. More commonly known (and maybe more accurately described) as “Summer Camp,” this invitation-only, three-plus days long assembly of several hundred people involved in building science is a geek's delight, featuring long days of lectures followed by dinner, drinks, and music until the wee hours. How we manage to get up and function each morning is one of the biggest mysteries at camp. If any Twitter fans are interested, look for #bscamp in tweets from this week to learn more.

Vapor Profiles Help Predict Whether a Wall Can Dry

Posted on August 5, 2010 by Peter Yost in Building Science

Today’s walls, roofs, and floors are better insulated, tighter, and made with a much greater variety of components than they used to be, making them a lot more susceptible to moisture problems when they get wet. Compared to the old days, today's walls and ceilings are more complicated and can be very slow to dry.

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