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Henry Gifford wearing a psychrometric chart T-shirt
Posted by Allison Bailes on August 2, 2012
One talk at the 2012 Building Science Summer Camp stood out above all the others. The last speaker on Tuesday was Henry Gifford. (Yes, that Henry Gifford!) When he was done, the majority of the audience stood and applauded. The next morning, camp counselor Joe Lstiburek told us there have been four...
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mechanical ventilation positive pressure ashrae 62.2 breathe fire
Posted by Allison Bailes on June 22, 2012
We want our homes to be airtight. It saves energy. It helps keep water vapor from getting into places where it can cause problems. It keeps bad air from moldy crawl spaces and contaminated garages out of the house. It just makes sense. Tight homes, though, need a way to replace stale indoor air...
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hvac system static pressure measurement new home design and commissioning
Posted by Allison Bailes on October 17, 2011
Ken Fonorow is a friend of mine whom I've known since my days on the Gainesville Energy Advisory Committee when I was in grad school in the mid-'90s. He's also helped build the market for ENERGY STAR and high performance homes in Florida. When I saw him last year at the Southeast Building...
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allison bailes energy vanguard air sealing attic sml
Posted by Allison Bailes on October 10, 2011
I've spent a lot of time in attics looking at problems with insulation, air sealing, HVAC systems, and ductwork. I've also seen why so many bathroom ventilation fans don't move much air. A typical bath fan is rated to move 50 cubic feet per minute of air when it's operating, but most actually move...
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ventilation ashrae 62.2 standard air sealing tight house fresh air
Posted by Allison Bailes on August 1, 2011
Guest Post. Today's article is a guest post by Paul Raymer, one of the top guys I know on the topic of getting fresh air into homes.
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power attic ventilator building science infiltration air leakage
Posted by Allison Bailes on June 8, 2011
Trade shows can be both educational and infuriating, and there’s one product I see at a lot of trade shows that fits easily into the latter category - power attic ventilators. The variety of this device that’s been popular lately is the solar-powered attic ventilator. Using the Sun to make the...
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A blower door tells you about the holes in a home's building enclosure
Posted by Allison Bailes on August 9, 2010
There's been a lively discussion going on in the RESNET/BPI group on LinkedIn. I posted my article about how infiltration occurs at the surface, not in the volume, and it's generated some good comments. In that article, I said we need to stop talking about infiltration rates in terms of air changes...
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atmospheric combustion water heater
Posted by Allison Bailes on May 26, 2010
Have you heard that one before, that you shouldn't seal up your house too tightly because a house needs to breathe? It's a common myth, but that's all it is - a myth. Houses do NOT need to breathe. People do.
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if-you-think-energy-star-version-3-was-hard-energy-star-logo
Posted by Allison Bailes on April 23, 2010
I've just finished going over the newly released ENERGY STAR 2011 guidelines for new homes and, as you might expect, I'm happy about some of the new requirements and disappointed/perplexed about others. Overall, though, the program is moving in the right direction, which it must because building...
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