What does IRS consider "insulation material or system specifically and primarily designed to reduce heat loss?" Nothing was found at irs.gov
Residential Energy Credit
Feb 25, 2008
2 Replies
Typically things like storm and double-pane windows. Siding usually does not qualify. Ask the people who installed the equipment or the manufacturer if their products qualify for the credit, or see if the product has the energy star label.
See Notice 2006-26
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