Two levels of window glazing enable you to fine tune protection from UV rays and control solar gain and heat loss increasing passive solar efficiency.
SunCoat® Low-E2 Glass
This microscopically thin coating is applied to one side of the glass to reflect heat from its source in the summer. It keeps heat inside in the winter and reduces harmful UV rays. SunCoat Low-E2 glass is standard on all Milgard dual-pane windows and patio doors.
Benefits
- Passive solar benefits include consistent temperatures for greater year-round comfort and energy savings.
- Reduces harmful UV rays by up to 84%, protecting furniture, fabrics and carpets.
| Glass Product | Visible Light Transmittance (higher is better) | Solar Heat Gain Coefficient (lower is better) | Winter Heat Loss - U-Factor (lower is better) |
|---|---|---|---|
| Clear single-pane | 90% | 0.86 | 1.04 |
| Clear double-pane | 81% | 0.76 | 0.48 |
| Hardcoat Low-E* † | 75% | 0.72 | 0.35 |
| Gray tinted* | 55% | 0.58 | 0.48 |
| SunCoat® Low-E2 glass | 70% | 0.37-0.41 | 0.30 |
| SunCoatMAX® * Low-E3 glass | 66% | 0.27 | 0.29 |
Note: All values calculated using Window 5.2 and represent center of glass properties. (See http://windows.lbl.gov/software/default.htm for more on the Window program.) All glass is 3mm thick, and ½" gap width. This is for comparable purposes only, your values may differ. Does not account for the affects of the frame and sashes with respect to the thermal information.
- * Used as one pane in a double-pane glass unit.
- † Hard-coat Low-E with 0.20 emittance.
SunCoatMAX® Low-E3 Glass
SunCoatMAX Low-E glass provides the best clarity and highest performance of all solar gain low-E glass products.
Benefits
- Increases center glass surface temperature in winter for comfortable, consistently cozy rooms.
- Reduces solar heat gain 34% over two-coat, low-E glass to keep houses cooler in the summer.
- Provides up to 95% ultraviolet light blockage for additional protection from UV-A and UV-B rays for fabrics and furnishings.
Milgard's SunCoatMAX even increases comfort in cooler temperatures. This chart shows the glass surface temperatures at two different outside temperatures. Milgard's SunCoatMAX maintains a higher interior surface glass temperature, even in the coldest temperatures. Why is this important? The Efficient Windows Collaborative suggests that, when glass surface temperatures fall below 52° F, there is a risk of thermal discomfort.
| Glass Product | Temp at Center of Interior Glass When -20°F Outside | Temp at Center of Interior Glass When +20°F Outside |
|---|---|---|
| Clear single-pane | 0° | 31° |
| Clear double-pane | 37° | 51° |
| Hardcoat Low-E* † | 47° | 58° |
| SunCoat® Low-E2 glass | 52° | 61° |
| SunCoatMAX® * Low-E3 glass | 52° | 61° |
Note: All values calculated using Window 5.2 and represent center of glass properties. (See http://windows.lbl.gov/software/default.htm for more on the Window program.) All glass is 3mm thick, and ½" gap width. This is for comparable purposes only, your values may differ.
- * Used as one pane in a double-pane glass unit.
- † Hard-coat Low-E with 0.20 emittance.
