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1961 First version of Economic Thickness for Industrial Insulation program developed as a card deck.
1973 Next version of card deck called Econ 1.
1980 Card deck converted to MS-DOS and called Economic Thickness for Industrial Insulation for Hot and Cold Surfaces, covering economics and payback.
Late 1980s Environmental aspect added to the program now called 3E Version 1.0.
1993 3E Version 2.0 released.
1994 “Plus” added to program name to connote performance of insulation in place. 3E Plus® also included a heat flow program.
1996 3E Plus® honored with US Dept. of Energy National Awards for Energy Efficiency and Renewable Energy.
1998 3E Plus® Version 2.1 released.
2001 3E Plus® Version 3.0 released. This was the first Windows version of the program and CO2 numbers were added.
2002 3E Plus® Version 3.1 released.
2005 3E Plus® Version 4.0 released. Close to 10,000 registered users.
2012 3E Plus v 4.1 released. Operates on Windows® XP, Vista and Windows 7. Over 15,000 registered users.
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