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Energy Vanguard Blog

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Is This the End of the Double-Wall, Cold Sheathing Scare?

 
double wall cold sheathing moisture content BSC 1

Insulation is good. More insulation is better (although at some point, more may not be cost effective). It reduces the amount of heat a home loses in winter or gains in summer. You can get there by building thicker walls and putting more insulation in the cavities, or you can put insulation on the outside of the structure, as in the Perfect Wall. The photo below shows thick insulation in the cavities of a home with double-wall construction.

A Beautiful Solar Home in Utah Nears Net Zero Energy Use

 
near net zero energy home utah 2

I'm writing this on St. Patrick's Day so let me tell you a wee bit about the O'Mearas. Kevin and Svetlana O'Meara live in a beautiful home in Utah that's oh-so-close to being a net zero energy home. After I wrote about how home building is like skiing two years ago, Kevin invited me out to see their home and this year I managed to do so. My wife and I visited them for two days last week and Kevin told me all about the house, including his one major regret.

The Problem of Getting Air for Atmospheric Combustion Appliances

 
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Remember those two furnaces I showed you photos of last week? You know, the ones that had ducts placed—or taped, in one case—right in front of them to bring them combustion air. I told you it wasn't a good way to deal with the combustion air issue, but let's go a little further today. Let's look at what building codes say is the right way to do it.

Passive House Builder Hammer & Hand Helps You Fight the Devil

 
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When I was building a home in 2001, I came across a gazillion little things that I needed guidance on. I'd never built anything larger than a bookcase, so new home construction was quite a big step. I bought books, scoured the web, and tried to get as much info out of Southface as I could, but I still couldn't find everything I needed. As a result, I made mistakes because, as you know, the devil is in the details.

An Energy Recovery Ventilator Is NOT a Dehumidifier

 
ventilation energy enthalpy recovery ventilator erv humidity

A common misconception about the energy recovery ventilator (ERV) is that it's good for humid climates because it helps to dehumidify a home. It's usually the better choice for a humid climate when you're trying to decide between an ERV or an HRV (heat recovery ventilator) but not because it's a dehumidifier. It is not a dehumidifier. Here's why.

4 Ventilation Quotes That Will Rock Your IAQ World

 
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I've been writing some articles on ventilation for the Journal of Light Construction lately and have come across some great material. The first quote here makes the point about indoor air quality with a graphic underwear metaphor. It's from an 1893 book whose author was a medical doctor and interested in ventilation to prevent diseases like phthisis (what we now call tuberculosis).

Beware These 3 Expensive Ventilation System Ripoffs

 
wave ventilation system crawl space model

How much does an exhaust fan cost? Search online and you can find lots of them that move 200 cubic feet per minute (cfm) for $100 to $150. But, if you put one in a semi-attractive (emphasis on the "semi") package, create some fancy marketing materials, and target people who don't know much building science, you can charge $1200 to $1700 for that same fan. At least that seems to be the business plan for these three companies.

Why Is This Obsolete Supply-Only Ventilation Method Still Used?

 
ventilation duct outdoor air return plenum

The small duct in the photo below is supposed to bring in outdoor air for ventilation in this new home.  It's a simple method that consists of a duct running from an outdoor wall cap to the return plenum of the HVAC system. A decade ago, it was commonly recommended as the easiest and least expensive way to ventilate a home in a humid climate. When I worked at Southface, however, we made the transition away from it for some very good reasons.

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The #1 Reason Power Attic Ventilators Don't Help

 
power attic ventilator fan gable vent

Three years ago I wrote an article titled, Don’t Let Your Attic Suck - Power Attic Ventilators Are a Bad Idea. Nearly a hundred thousand page views and 93 comments later, it's still generating lots of heat. I don't know why so many people are so defensive about power attic ventilators, but here are a few of the things they've said to me in the comments:

Stockton Project Demonstrates Huge Home Energy Savings

 
bruce wilcox john proctor dry climate forum 2014

At the Forum on Dry Climate Home Performance earlier this year, I got to hear three building science experts talk about a really cool research project they've been working on in Stockton, California. Bruce Wilcox, John Proctor, and Rick Chitwood (Wilcox and Proctor shown in photo at left) filled us in on the Stockton project, which now has two years of data and shows some really impressive results.

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