Can I replace my window panes and/or sills but not the frames?

No. You must replace the entire window, including the frame, in order for your window upgrade to be eligible for a rebate or to count toward the Bonus Offers. The whole window assembly must be ENERGY STAR^®  certified and must be listed on the ENERGY STAR certified fenestration list for windows and doors. For complete window and door eligibility requirements, see the Window and Door Rebate page.

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