If building a better, more marketable product interests you, below are links which should be of interest:

 
Here you can find out more about Energy Star Homes & how to become an Energy Star Partner (it's free) 

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Here you can find out more about HERS certified Homes & how to become a RESNET Energy Smart Builder

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Here you can find out more about 2009/2012/2015 IECC Code Compliance

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