Especially important during monsoon season, seek windows with an air infiltration rating below 0.1 cfm/ft² to keep dust and hot air out. Optimal Materials and Glass Technology Renewal by Andersen Window Replacement
| Metric | What It Measures | Tempe Target | |--------|----------------|---------------| | | Insulation (heat loss in winter) | ≤ 0.25 (lower is better) | | SHGC (Solar Heat Gain Coefficient) | Solar heat blocked | ≤ 0.23 (critical for summer) | | VT (Visible Transmittance) | Natural light let in | ≥ 0.40 (so rooms aren’t dark) | | Air Leakage | Air infiltration through frame | ≤ 0.1 cfm/ft² |
: The most durable option; it resists warping and expansion under intense UV exposure.