The Latest from the Energy Vanguard Blog

Air sealing the Build SMART wall panels with a sausage gun
Posted by Allison Bailes on May 1, 2017
Seven years ago Georgia led the nation. Yep. We were the first state to adopt an energy code that made blower door testing mandatory. All new homes built in the state had to show through performance testing that they had an air leakage rate of less than 7 air changes per hour at 50 Pascals of...
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This heat recovery ventilator is inside the building enclosure
Posted by Allison Bailes on February 10, 2017
If you've been hanging around here for a while, you know I encourage architects and builders to find a way to get the ductwork and heating and cooling systems inside the conditioned space of a home. In cold climates, this usually happens without much argument. In hot and warm climates, we're not...
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ventilation energy enthalpy recovery ventilator erv humidity
Posted by Allison Bailes on January 25, 2017
"You know where this is going, right? Codes will eventually require balanced ventilation." I've heard people say this more than once in the past year or so. As someone who has been attending the semiannual meeting of the ASHRAE 62.2 committee, I've been skeptical. Then I read the new Aspen energy...
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humidifier-indoor-humidity-mold.jpg
Posted by Allison Bailes on November 14, 2016
It's that time of year when heating systems start coming out of their summer hibernation. (Except maybe in Vermont. Michael Blasnik's Nest data showed that Vermonters are about the last to start heating their homes in Fall.) Then everyone starts looking for their lotion and lip balm. Gaps appear in...
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basement-moisture-problem-mold-humidity.jpg
Posted by Allison Bailes on October 31, 2016
Lying in bed. Feel like I've run a world record mile. Can't...catch...my...breath. I take the deepest breath I can. The noisy air provides little sustenance for my oxygen-starved lungs.
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spray-foam-insulation-attic-humidity.jpg
Posted by Allison Bailes on October 26, 2016
Three weeks ago, I wrote about an attic with spray foam insulation and the interesting humidity pattern we observed in it. We placed data loggers near the ridge and floor of the attic as well as in the living space and outdoors. In that last article, I showed the dew point data for the four...
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bathroom-remodel-bath-exhaust-fan-ceiling.jpg
Posted by Allison Bailes on August 23, 2016
Remember my bathroom remodeling project? I took the liberty of gutting our outdated, decaying bathroom while my wife was out of town in April. I found some interesting air leakage pathways when I opened the walls. I fixed that. I found termite damage. I fixed that. Our 1970 condo didn't have an...
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filter-over-plenum-hole-ventilation-air-intake.jpg
Posted by Allison Bailes on August 5, 2016
I've seen some crazy things done to homes. It's usually someone's attempt to make things better. Sometimes that someone is a homeowner or other occupant. Sometimes it's a contractor. But it always seems to be a solution to a problem that creates other problems. It's just like they say: Our biggest...
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prefab-passive-house-richard-pedranti-architect.jpg
Posted by Allison Bailes on July 22, 2016
Last month I attended the conference of the North American Passive House Network in New York City. They had a really nice trade show, and I got to spend some time talking to the vendors. It's always nice to see what's going at these events because I'm starting to come around to Joe Lstiburek's way...
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ventilation energy enthalpy recovery ventilator erv humidity
Posted by Allison Bailes on July 21, 2016
Ah, ventilation. One of the easier topics in building science. Everyone agrees: We need airtight houses. Airtight houses need mechanical ventilation. Build tight. Ventilate right. No problem! We're all on board. There's nothing to disagree about. Right?
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