ENERGY STAR® changes
As of February 1, 2015, Natural Resources Canada has revised the criteria for ENERGY STAR certified windows, doors and skylights sold in Canada:
| Previous Criteria | New Criteria | ||
| Zone | Heating degree range | Zone | Heating degree range |
| A | ≤3500 | 1 | <3500 |
| B | >3500 to ≤5500 | 2 | 3500 to <6000 |
| C | >5500 to ≤8000 | 3 | ≥ 6000 |
| D | >8000 | ||
For Alberta Homeowners, this means you are now in Zone 2 or 3 depending on where you live:
