I'm interested in locating some online tools that roughly calculate homeowner energy efficiency.  Things similar to this -


I've been able to find many cell phone apps but not many good ones for PC.

Does anyone know of any similar programs / tools online that are free?



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Great stuff, thanks Ted!

You are welcome Tyler!  

Here's one I forgot - video of Phil Jeffers "Auditor" software: http://bit.ly/auditorvideo

Try www.ResidentialEnergyDynamics.com for RED Calc Free tools. These free calculation tools are not aimed at homeowners, but at energy professionals. More energy and diagnostic tools are added frequently.

The list now includes:

  • ASHRAE 62.2-2013
  • ASHRAE 62.2-2010
  • Ventilation electrical usage
  • Depressurization analysis
  • Pitot tube airflow
  • Box airflow
  • Dense-pack insulation
  • Loose-fill insulation
  • Surface heat transfer
  • Infrared R-value
  • Parallel-path R-Value


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