I wouldn't "forget about it". There is no additional "amended" tax preparation fee and no E-filing fee for your amended return, just your time.
Amending your return means filing a new form, 1040X. Since your refund amount will change with the addition of a window energy credit, it's appropriate to file an amended return.
To file an amended return, please see How to amend (change or correct) a return you've already.
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