LUXHAUS · WINDOWS & DOORS

Standard double pane vs Passive House triple pane.

Compare a conventional ENERGY STAR double-pane window (24–26 mm) against a 48–56 mm triple-pane Passive House system — tuned to your climate. Every metric, side by side, with the difference made plain.

STANDARD · 24–26mm 3–4mm 2 panes · 24 mm 3–4 mm glass each vs PASSIVE HOUSE · 48–56mm 5–8mm 3 panes · 48–56 mm 5–8 mm glass each
Select your climate zone
Your climate, your difference
Standard ENERGY STAR double pane · 24–26 mm
Passive House triple pane · 48–56 mm
the difference
How the two systems differ
A third pane, an extra low-E coating and insulating gas change how heat, sun and sound behave at the glass.
2 PANES Double-pane 3 PANES Triple-pane
Heat retention
Extra panes and insulating gas hold interior warmth in — far less heat escapes through the glass.
SUN IN Double-pane REFLECTED Triple-pane
Solar control
Low-E coatings reflect most of the sun's heat back outside instead of letting it into the room.
NOISE IN Double-pane DAMPED Triple-pane
Noise reduction
More mass and asymmetric glass thicknesses absorb outdoor sound, so far less reaches the room.

LuxHaus offers over 400 glass make-ups — combinations of pane counts, low-E coatings, gas fills, laminates, tints and warm-edge spacers — each tuned to a project's climate, orientation, solar exposure and acoustic needs.

This tool is a directional guide intended to help you understand the difference between a standard ENERGY STAR double-pane window and a 48–56 mm triple-pane Passive House system — it is not an exact or guaranteed specification. The values shown are representative and will vary with the specific glass build-up, coatings and gas fill, the frame and spacer, installation quality, window size and orientation, and local climate data; energy-demand figures are indicative annual glazing-attributable savings, not measured results. Because no single comparison can capture all 400-plus build-ups, these numbers should not be used for engineering, code-compliance, energy-modelling or contractual purposes. Your final specification — including U-value, SHGC, acoustic ratings and energy performance — is confirmed per project by a LuxHaus specialist.

LuxHaus Windows & Doors — Passive House-grade triple-pane systems, certified worldwide.

Window IQ is LuxHaus’s window cost calculator — a free tool that shows you the real 25-year financial gap between standard windows and high-performance European alternatives. Most window buyers focus on the purchase price. Window IQ shows you what that decision actually costs over time, across three dimensions that matter: energy savings, soundproofing value, and total ownership cost.

What the Window Cost Calculator Measures

Standard windows and high-performance European windows look similar on a spec sheet. The difference shows up in your energy bills, your indoor comfort, and the resale value of your home or building over time. Window IQ runs a 25-year analysis across three cost factors:

  • Energy savings — how much less you spend heating and cooling when your windows have a lower U-value and better air sealing
  • Soundproofing — the real-world acoustic improvement of double vs. triple glazing, and what that’s worth in livability and property value
  • Total ownership cost — purchase price, installation, maintenance, and energy costs combined over 25 years, so you can compare apples to apples

Grounded in Real Methodology

Window IQ calculations use heat loss and energy cost methodology consistent with U.S. Department of Energy guidance on residential window performance and Passive House Institute standards for high-performance fenestration. The numbers you see are based on real thermal physics, not marketing assumptions.

Who Should Use Window IQ?

This window cost calculator is built for anyone making a serious window buying or specification decision:

  • Homeowners renovating or building new, who want to see whether the upgrade to high-performance windows pays off over time
  • Architects and specifiers who need to justify premium window specifications to budget-conscious clients with real numbers
  • Developers and builders comparing the long-term cost impact of different glazing specifications across a project
  • Energy consultants modeling Passive House or near-zero energy building performance

From the Calculator to the Right Window

Once you’ve run your numbers in Window IQ, LuxHaus can match you with the right product from our European window and door range. Whether your analysis points to tilt-and-turn windows, lift-and-slide doors, or entrance systems, we can quote the exact specification your calculator results suggest. Ask Emma, our AI window advisor, is also available 24/7 to help you interpret your results and choose the right product for your project.