The Latest from the Energy Vanguard Blog

Air conditioner supply vent with mold because of sweating
Posted by Allison Bailes on July 23, 2020
Back in the summer of 2005, I got a call to figure out a moisture problem in a new house.  The homeowners took me into the master suite, where the first thing to catch my eye was the towel folded neatly on the floor.  It hadn't just fallen out of the laundry basket; it was there to catch the water...
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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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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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Low indoor relative humidity in winter is common
Posted by Allison Bailes on February 15, 2019
I'm going to go out on a limb and make what you may think is an outrageous statement:  Water is the most interesting substance in the world.  Some of you may immediately respond, "Oh, yeah!  What about beer?"  (Or wine or Sidecars, Negronis, or Sazeracs or whatever your drink of choice is.) ...
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Condensation on stone steps in New Orleans on a February morning
Posted by Allison Bailes on April 18, 2018
If you live anywhere in a warm, humid coastal area, you're no doubt familiar with wet concrete in winter. Some days you walk outside and find the carport slab is soaking wet. How did it happen? Did rain blow into the carport? If it's not rain, is it moisture from the ground that came up through the...
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