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Free Building Science Calculation Tools for Energy Professionals

What's New with RED

Wood Moisture Content tool
  • With the use of a wood moisture meter, you can calculate the relative humidity of the surrounding air or wood equilibrium moisture content.

Condensation in
Dense-Packed Cavities

  • A new article by RED's CEO, Charlie Holly, explains why condensation may occur in dense-packed cavities and why that may be ok.

Who Uses RED Calc Free Tools?

  • Home performance analysts
  • DOE weatherization energy auditors and quality-control inspectors
  • Energy auditors
  • HERS raters
  • Design professionals
  • HVAC analysts and installers
  • Building inspectors
  • Architects
  • Engineers
  • Building science researchers

First-Time Users, Start Here. . .

1. Watch this video tutorial at the RED YouTube Channel;

2. Read the Getting Started help document;

3. Use the RED Calc Free menu on the left to try any of the tools;

4. Click the "i" in the blue circle to the right of any tool name in the menu at the left for more information;

5. Click/touch any tool input or result label to see popup help when you need it; and

6. The advanced features of RED Calc FreeTM  will run on the latest versions of all common web browsers.

     Screenshot of Weather Station Data tool

Weather Station Data tool screenshot

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