Can you help me to better understand the numbers? What’s a good U-factor number? What’s a good SHGC?
Different homeowners seek out different levels of efficiency, but a “good” U-factor is <.30. In the Northern Zones, a U-Factor even lower than .30 may be beneficial to increase your energy efficiency and home comfort. A “good” Solar Heat Gain rating, meanwhile, on a scale from 0 to 1, is relative to climates in different regions. Low SHGC numbers are best for southern climates where there’s intense sun exposure, whereas higher SHGC values may make sense for regions with cold winters.
Can you explain Low E coatings?
The ability of a material to radiate energy (heat) is called its emissivity. Extremely thin coatings of special low emissivity (Low E) metallic material are applied to glass panes used in windows and doors to boost their energy efficiency. Low E coatings, usually applied to the inside layers of insulating glass, manage the amount of light and heat either transmitted through a window or reflected away from it.
What are the advantages to selecting triple pane windows?
Triple pane windows work best when enhanced energy performance is a key objective. Triple pane windows are designed to reduce U-Factor as compared to dual pane. They offer a range of low-E configurations, along with Low ERS, and with either an argon gas fill or air for high altitude applications. Triple pane glass can also provide more in home comfort in cold environments because the interior surface of the glass is warmer, reducing convection currents. But no matter how many panes there are, if the window is poorly constructed, poorly installed, or allows air leakage, it will be inefficient.