This comprehensive chart shows performance data for a number of different window products.

For Texas homeowners a window with low SHGC, low U-factor, high visible light (VT) and low Tuv (fading) are most desirable.

A careful look at the chart reveals that low solar low-E glazing has by far the best combination of benefits:

• Low SHGC to protect against solar heat
  
  
• Low U-factor to better insulate at all times of day and season
  
  
• Low Tdw to protect against fading
  
  
• High VT to allow daylight into the home