The Latest from the Energy Vanguard Blog

spray foam insulation on roofline for building envelope relocation
Posted by Allison Bailes on May 23, 2011
Putting spray foam insulation on the roofline of both existing homes and new homes has been growing in popularity over the past decade. But, is it always the best way to treat the building envelope? When does it make sense to spray foam the roofline, and when does it make more sense to keep the...
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Oversized air conditioner
Posted by Allison Bailes on May 12, 2011
I was checking some REM/Rate files for our HERS raters yesterday, mostly submitted for ENERGY STAR homes. I've come to expect Manual J heating and cooling load calculations submitted along with the files to be less than perfect. Mostly, I accept them because they're close enough.
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Mitsubishi's City Multi ductless mini-split heat pump, ceiling cassette
Posted by EV Staff on May 11, 2011
In my last four HVAC Design jobs, I've specified ductless mini-split heat pumps. I have four more such jobs underway now.
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mitsubishi hvac mini split heat pump carl green curmudgeon seville
Posted by Allison Bailes on May 6, 2011
Last week, (EVER rater and Green Curmudgeon) Carl Seville and I took a trip up to Suwannee, Georgia to visit the Mitsubishi HVAC facility and learn more about their ductless heat pumps. I've mentioned here before that when I get a chance to build a house for myself again, I'd like to eliminate the...
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dont design the cart before the horse mercer-williams house
Posted by EV Staff on May 4, 2011
My recent visit to Savannah for the USGBC's green product expo charged up my historic preservation bug and got me to thinking about how to apply building science to historic buildings.
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duct system trunk and branch hvac design endcap
Posted by Allison Bailes on April 21, 2011
I've been thinking lately that I might be in danger of losing all my friends in the HVAC business because I've been a bit heavy on showing examples of what they get wrong but not so good at showing what they do well. If you read my article Why Won't the HVAC Industry Do Things Right?, you may...
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no-more-damn-architects-view-of-mountain-valley
Posted by EV Staff on April 19, 2011
In 1997, I helped my parents design and build their home. Early in the construction process, I had suggested that the house be built 25 feet back from where we originally had it planned, and that the fireplace be moved to the back side of the living room. We had already put the stakes in the ground...
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Duct against the roof deck in an unconditioned attic
Posted by Allison Bailes on April 15, 2011
I had lunch yesterday with a friend who's an HVAC designer and HERS rater in North Carolina, and he mentioned the idea of separating HVAC design from HVAC contractors. For that to happen, though, HVAC contractors first have to start doing the design part because most residential HVAC systems are...
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ducts radial system outside building envelope in attic
Posted by Allison Bailes on April 12, 2011
It started on Twitter the other day. I posted the photo you see to the left, and a discussion on flex duct ensued. One person, who's been known for taking strong stances now and then, saw it and said, "Flex isn't allowed in any of the green building programs (that are worth a damn that is)."
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