A website by the author of a McGraw-Hill textbook, "Retrofitting for Energy Conservation" where all the software featured in the book can be downloaded FREE. Several programs are of interest to trades people, and require no specific engineering expertise. Others do more robust analysis but are still easy for engineers and designers to learn and use. You can use them to analyze all the best energy saving projects for any building type - attic insulation, double paned windows, lighting, programmable thermostat controls, and many more.
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