How much is your current window spec really costing?
For new-build projects. Compare typical North American double & triple-pane windows against LuxHaus European systems across the five metrics that matter: thermal performance, acoustic isolation, solar control, service life, and projected HVAC bill. Adjust for your project — the numbers update in real time.
Window Performance Report
Optional · Project InfoBrand this report
Fill in any of these — they'll appear on the PDF report. Leave blank to generate a generic Window IQ report. Nothing is saved or transmitted; this is for your branded output only.
Step 1 · Project ParametersDefine the Build
Project Region
Fine-tune window specsOverride any parameter with your project's actual glazing package
Current window (North American spec)
Air leakage around sash and frame adds real heat transfer beyond the U-value. The NFRC AL rating measures airflow in cfm/ft² at design pressure. Lower is tighter. LuxHaus European systems are tested to EN 12207 Class 4 (the European equivalent of NFRC ≤ 0.1 cfm/ft²) — effectively airtight, the 1.00× baseline.
LuxHaus window (European spec)
2,800sq ft home · ≈ 448 sq ft of windows (16%)m² home · ≈ 42 m² of windows (16%)
448sq ft of windows & doorsm² of windows & doors
Steady-state methodology uses textbook U-value × HDD math. Real-world bills run much higher due to HVAC part-load inefficiency, duct losses, thermostat creep, non-linear infiltration in extreme temperatures, and sand/dust accumulation in GCC contexts. Multiplier auto-sets by climate on region change (cold = 2.0–2.5×, mixed = 1.5×, warm = 1.2×, GCC extreme-hot = 1.6×) based on NRCan, NREL, LBNL, KAUST, and Masdar Institute studies. Override anytime.
$0.245per kWh · marginal rate
Optional · Cost of Ownership InputsEnter quoted prices and lifespans to model true 50-year cost of ownership. Leave blank to skip — the rest of the analysis still runs.
Current Window Spec
$—competitor quote today
—years to first replacement · industry typical: 15–20 yrs
LuxHaus Spec
$—LuxHaus quote today (quoted or estimate)
50years · LuxHaus 50+ year design life · industry: 15–20 yrs
LuxHaus systems are engineered for a 50+ year design life — most North American and GCC residential windows fail at 15–20 years. The "True Cost of Ownership over 50 Years" card below uses these inputs to show the full picture: purchase + replacements + HVAC over half a century. Replacement cost inflates 3%/year. All values stay private to this session.
Step 2 · The Performance GapWhere LuxHaus Moves the Needle
Regional Code Minimum vs. Current vs. LuxHaus
Code Minimum
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Your Current Selection
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LuxHaus Spec
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Set your parameters above, then tap Calculate the Gap to see the comparison.
Thermal performance · lower U-value is better
Current
U-0.28
LuxHaus
U-0.13
Acoustic isolation · higher STC is better
Current
STC 28
LuxHaus
STC 40
Side by SideFull Specification Delta
Metric
Current Spec
LuxHaus System
Difference
Step 3 · The Long-Term Picture25-Year Outlook
Annual HVAC Bill Savings
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Projected heating & cooling bill reduction for this new build. Compares the full HVAC operating cost at each window spec, holding the rest of the envelope equal.
25-Year HVAC Cost
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vs. $— with current spec
Replacement Cost Avoided (inflated)
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Total 25-Year Advantage
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Combined energy savings + avoided replacement cost over 25 years. Excludes resale value, occupant comfort, and health benefits.
Opportunity costWhat if the savings were invested instead?
If both savings streams — annual energy savings and the avoided replacement cost — were invested in an S&P 500 index fund at the historical 10% average annual return. Annual savings compound across 25 years; the avoided replacement lump sum compounds from when it would have been spent through year 25.
Submit your plans and we'll return a free estimate within 5–7 business days. Factory-direct from Germany, Italy & Poland. Passive House suitable. No showrooms, no middlemen.
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.
