The complete source for building, designing, and remodeling green homes

Building Science
The Four Laws of Thermodynamics

We often talk of the second law, but what are the other three?
Building Science
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?
Building Science
Water Tables and Basements

How to use geologic, soil, and historical maps to keep your basement dry
Building Science
Door Undercuts for Return Air

You don’t always need to install individual returns, transfer grilles, or jumper ducts
Building Science
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
Building Science
Four Sources of Crawlspace Moisture

To stop moisture problems in vented crawlspaces, you have to know where the moisture comes from
Building Science
The Difficulties of Third-Party HVAC Design

How do we get everyone on the same page?
Building Science
Pete’s Product Puzzle: VersaDry

Simple folded metal solves a common moisture problem
Building Science
Thinking Clearly About the 3 Levels of the Building Enclosure

Doing so can help you avoid scams, investigate failures, and maximize performance
Building Science
Is It Possible to Get Condensation on a Sponge?

A little building science puzzler on moisture and the properties of materials

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