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EnergyPlus 7.2.0 is now available. Learn about the new features. EnergyPlus is a whole building energy simulation program that engineers, architects, and researchers use to model energy and water use in buildings. Modeling the performance of a building with EnergyPlus enables building professionals to optimize the building design to use less energy and water.

I utilized this program in my design work at Northeast Solar. What I really like about this application is 1. It's free and 2. You can share you Templates with the world. Oh, and 3. You have access to all the Free Templates from the World! Some great person shared a template (Template = a design package including tools, data, configurations, that you can utilize in the sketch up world) that I can use in unison with Google Earth, to design, plan, measure, size, and then show, what Solar electric (PV) opportunity they have for their building. It was really useful. SketchUp is 3D modeling software that's easy to learn and incredibly fun to use. Download SketchUp today for free and get started drawing in 3D.

Opower offers energy management and customer relations via software.