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European Windows & Doors in Illinois
Made-to-order tilt-turn windows, folding doors and lift & slide doors, shipped to homeowners and builders in 6 Illinois cities. Your contractor or an independent local installer handles installation.
City by city
Window energy rules across Illinois
Each city's climate zone, the energy code it enforces for new homes, and the highest window U-factor that code allows (lower is better). SwingTilt's triple-pane windows have a U-factor of 0.19.
| City | Climate zone | Energy code for new homes | Max window U |
|---|---|---|---|
| Aurora | 5A | 2024 Illinois Energy Conservation Code (statewide) | 0.28 |
| Chicago | 5A | 2022 Chicago Energy Transformation Code (2021 IECC based) | 0.30 |
| Naperville | 5A | 2024 Illinois Energy Conservation Code (statewide) | 0.28 |
| Peoria | 5A | 2024 Illinois Energy Conservation Code (statewide) | 0.28 |
| Rockford | 5A | 2024 Illinois Energy Conservation Code (statewide) | 0.28 |
| Springfield | 5A | 2024 Illinois Energy Conservation Code (statewide) | 0.28 |
Checked October 2026; sources are linked on each city page. Codes change — confirm with your local building department.