Old windows leak like open doors. New energy-efficient windows are one of the smartest upgrades for Wisconsin homeowners with high heating bills.
Energy efficient windows for Wisconsin should have a U-factor of 0.27 or lower, Low-E coating, and argon or krypton gas fill. These windows reduce heat loss through glass by up to 50% and qualify for the federal energy tax credit of up to $600. Combined with reduced heating costs of 15-25%, most homeowners recover the investment in 7-12 years.
| Rating | What It Measures | WI Minimum | Recommended |
|---|---|---|---|
| U-Factor | Heat loss rate (lower = better) | ≤0.30 | ≤0.25 |
| SHGC | Solar heat gain (lower = less summer heat) | ≤0.40 | 0.25-0.35 |
| VT | Visible light transmission | N/A | 0.40+ |
| Air Leakage | Infiltration rate | ≤0.30 | ≤0.15 |
The Energy Efficient Home Improvement Credit (25C) provides:
In Wisconsin, replacing single-pane windows with Energy Star double-pane saves $200–$600 per year in heating costs. Replacing aging double-pane (pre-2000) with current technology saves $100–$300 per year. Savings depend on home size, number of windows, and current window condition.
For north and west-facing windows, yes. Triple-pane adds another 15-20% efficiency over double-pane. For south-facing windows that get solar gain, quality double-pane with Low-E is usually sufficient. A mixed approach (triple where needed, double elsewhere) balances cost and performance.
Free inspections. Transparent pricing. Lifetime warranty on every project.