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Author: Allison Bailes, III, PhD

Allison A. Bailes III, PhD of Decatur, Georgia, is the founder and owner of Energy Vanguard in Decatur, GA, and the author of the Energy Vanguard Blog. Also, check out his in-depth course, Mastering Building Science at Heatspring Learning Institute, and follow him on Twitter at @EnergyVanguard

7 Reasons Filters Don’t Improve Indoor Air Quality

Indoor air quality (IAQ) researchers have established that little bitty invisible pieces of stuff that float around in the air […]

Ranking Indoor Air Pollutants

That face above is of a physician, alchemist, and astrologer named Philippus Aureolus Theophrastus Bombastus von Hohenheim.  He is deemed […]

What Is the Relative Humidity When It’s Raining?

Serious question here.  Have you ever thought about what the relative humidity is when it’s raining?  I’ve heard people say […]

Make Dew Point Your Friend

I’ve been on a bit of a mission for the past several years.  My goal is to get more people […]

Solving the Difficulties of the Low-Load Home

I found out last month that the Air Conditioning Contractors of America (ACCA) is working on a new design manual.  […]

Are You Making These Mistakes With Manual J?

When you do a heating and cooling load calculation using ACCA Manual J, it’s important to be as accurate as […]

HVAC Design Is About More Than Equipment Sizing

Many people seem to think HVAC design means you get a load calculation (Manual J in the ACCA protocols) so […]

The Physics of Heat and Air Flow

Heating and cooling loads matter. That’s why we do load calculations. We enter all the details of the building, set […]

Is a Ventless Fireplace More Efficient Than a Condensing Furnace?

One of the primary benefits of an unvented gas fireplace is that you don’t lose any heat up the flue. […]

Is R-8 Really Enough for Ducts?

If you know a little building science, you’ve no doubt seen a lot of problems that occur with air distribution […]

Ventilating A Home In Cold Weather

When I woke up on a recent Saturday morning, the temperature outdoors was -40 degrees†. The wind chill was -100 […]

The Four Laws of Thermodynamics

Building science is an odd subject. Few colleges and universities teach it. The majority of those who work on buildings […]

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