Link to the Department of Energy's list of appropriate energy calculators and the IRS' Notice 2006-52. | Professional Roofing magazine

Link to the Department of Energy's list of appropriate energy calculators and the IRS' Notice 2006-52.

IRS' Notice 2006-52:
https://www.irs.gov/pub/irs-drop/n-06-52.pdf

Department of Energy's list of appropriate energy calculators:
https://www.eere.energy.gov/buildings/tools_directory/

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