Recent Articles
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The Buy-in Problem
From code compliance to Passive House certification, getting good work from contractors is hard
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Exterior Insulation on 2×4 Walls Versus 2×6 Walls With Cavity Insulation Only
A look at some modeling results may help you decide
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How Does a Heat Pump Get Heat From Cold Air?
The physics of heat pumps isn’t really that difficult to understand
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Two Rules for Humidity
To prevent moisture damage from humid air, just do these two things
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The Four Laws of Thermodynamics
We often talk of the second law, but what are the other three?
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How Many Tons of Air Does a 2.5 Ton Air Conditioner Move?
And under what conditions would it move exactly 2.5 tons of air?
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When Are Door Undercuts Sufficient for Return Air?
You don’t always need to install individual returns, transfer grilles, or jumper ducts
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An Easy Retrofit for Return Air
For homes without dedicated return grilles in the bedrooms, this easy-to-install device provides a return air pathway
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Four Sources of Crawlspace Moisture
To stop moisture problems in vented crawlspaces, you have to know where the moisture comes from
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The Difficulties of Third-Party HVAC Design
How do we get everyone on the same page?
