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View all guides →Understand ENERGY STAR windows certification: exact requirements by climate zone, what doesn't qualify, NFRC labels, federal tax credits up to $600, and why it cuts energy bills. Get facts on ENERGY S
Spot the 8 signs it's time to replace your windows: drafts, condensation, and more old window problems. Learn repair vs. replacement, costs ($300–$1,500/window), savings ($100–$465/year), and when to
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Learn eligibility, ENERGY STAR rules, and step-by-step filing for the 25C tax credit on energy efficient windows. Claim 30% back up to $600 with IRS Form 5695. 2026 guide for homeowners.