The Latest from the Energy Vanguard Blog

The Sterling chart, from a 1986 research paper, suggests an optimum zone for relative humidity
Posted by Allison Bailes on July 9, 2020
The classic chart demonstrating the importance of keeping to the middle of the relative humidity spectrum has been shown to countless attendees of classes, conference presentations, and webinars on building science, indoor air quality, moisture problems, and health.  I can't tell you how many times...
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Frost formed on the part of my car that was under the open sky but not the part under the roof
Posted by Allison Bailes on February 24, 2020
On Saturday morning as I was heading out for a run at the Chattahoochee River, I found my car in the condition you see in the photo above.  Let's ignore the reason I was parked half in and half out of the garage and focus on the frost instead.  As you can see, the frost appeared only on the back...
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What is the perfect weather for a dehumidifier?
Posted by Allison Bailes on January 17, 2020
That dehumidifier you see in the photo above is in the Energy Vanguard office here in Decatur, Georgia.  The compressor doesn't come on often, but this past week I've heard it running quite a bit.  Depending on where you're from, you may be thinking, "Yeah, it's always humid in the South.  I don't...
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What the heck is going on with this hotel room window?
Posted by Allison Bailes on January 22, 2019
The ASHRAE conference and AHR Expo were in Atlanta last week.  Because I live here, I didn't have to stay in a hotel but a lot of people I know came to town and did stay in hotels.  One of them, John Rockwell of ERV & HRV manufacturer Zehnder, sent me the photo above of the window in his room...
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A fogged up car windshield is easier to clear if you apply psychrometrics
Posted by Allison Bailes on January 18, 2019
A lot of people don't understand the best way to defog their car windshield in wet, cool weather.  About 30 years ago, I was on a group trip on a hired shuttle bus.  The outdoor temperature was probably in the 40s Fahrenheit and it was raining.  Perfect conditions for fogging up the interior glass...
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Professor John Straube presenting on moisture physics at the 2018 Building Science Summer Camp
Posted by Allison Bailes on August 22, 2018
The 22nd annual Westford Symposium on Building Science (aka, Building Science Summer Camp) happened two weeks ago.  And it began with a bang, as Professor John Straube expounded on moisture physics for half a day.  I've now had the chance to hear him present on mechanical systems for low-load homes...
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Does the relative humidity have to be 100% whenever it's raining?
Posted by Allison Bailes on August 21, 2018
Serious question here.  Have you ever thought about what the relative humidity is when it's raining?  I've heard people say it's 100% because, well...because it has to be.  It's raining, dammit!  What else could it be? Not so fast there.  This is something we can actually look up on a weather app...
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