Double-Pane Windows
Insulated glazing units (IGUs) with two panes of glass separated by an argon- or krypton-filled spacer — the modern residential standard.
Quick answer
Double-Pane Windows: Insulated glazing units (IGUs) with two panes of glass separated by an argon- or krypton-filled spacer — the modern residential standard. Typical cost: $450–$1,200 per window installed; $5,000–$15,000 for a typical 10-window home..
Why it matters
Replacing single-pane with ENERGY STAR double-pane cuts heating/cooling energy use 10–25% and qualifies for a 30% federal tax credit up to $600 per year.
Typical cost
$450–$1,200 per window installed; $5,000–$15,000 for a typical 10-window home.
Pros
- • 10–25% energy savings
- • Federal tax credit
- • Noise reduction
- • Wider warranties than single-pane
Cons
- • IGU seal can fail at 15–25 years
- • Premium for low-E and gas fills
- • Whole-frame replacement adds cost
Common uses
- • Whole-home window upgrades
- • Single-window failures
- • Code-required replacements
Alternatives
Triple-pane (cold climates)Storm windows over single-pane (lower cost retrofit)
Learn
All windows answers
Calculate
Windows Cost
Browse
All entities
Related questions
People also search for
Frequently asked questions
- Are double-pane windows worth it?
- Worth it in any climate where you heat or cool — payback is 7–15 years from energy savings alone, faster with the federal credit.
HomeownerAnswers.com
Search another homeowner question
Costs, repair vs replace, financing, insurance — get an answer in seconds.
Estimates and guidance are educational. Always confirm with a licensed local professional before making decisions.