The numbers that matter
U-factor measures heat loss, lower is better and it drives winter comfort. SHGC (solar heat gain coefficient) measures how much solar heat comes through, lower keeps summer heat out. Every legitimate quote should list both per window line.
Both heating and cooling matter, so look for a balanced package: a low U-factor for winter and a moderate solar heat gain coefficient so you keep some free winter heat without cooking in July.
- Balanced low-E package, low U-factor with a moderate SHGC
- Argon fill and a warm-edge spacer to cut condensation at the glass edge
- Insulated vinyl or fiberglass frames
- Full air sealing of the rough opening, not just spray foam at the corners
Rebates, credits, and what to verify
Federal energy-efficiency tax credits for qualifying windows have applied in recent years with annual caps, and some utilities run their own rebate programs. Rules change, so confirm current eligibility and the required performance ratings before you count on a credit, and keep the NFRC documentation with your receipt.
What the install does to the numbers
A high-performance window installed badly performs like a cheap one. Perimeter air sealing, correct flashing at the sill, and shimming so the sash operates square are what turn the label rating into real comfort. Ask how the crew seals and insulates the rough opening.
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Frequently asked questions
Why do my windows fog up between the panes?+
That is a failed insulated glass seal. The gas fill has escaped and moisture has migrated between the panes. It can't be fixed by cleaning, the sash or the glass unit has to be replaced, and if several units have failed at once the whole run is usually near end of life.
Will new windows pay for themselves in energy savings?+
Rarely on energy savings alone. The honest case for replacement is comfort, noise, operation, and eliminating rot or air leaks, with utility savings as a secondary benefit.
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See your personalized remodel plan in 2 minutes
Tell me a bit about you and I'll tailor the plan to your home and budget. No pressure, no obligation.