Building for Net Zero: Mastering U Values and SHGC 

How Do Fiberglass Windows Help Reduce Your Carbon Footprint?

Are you committed to building a net zero home and reducing your carbon footprint? Fiberglass windows offer superior energy efficiency with low U values, reducing heat loss in winter and heat gain in summer. Their durability means fewer replacements, cutting down on waste. Plus, their production has a smaller environmental impact than PVC/vinyl. Fibreglass windows enhance your home’s energy efficiency and support a greener planet.

Understanding U Values and SHGC:

To Understanding U values and Solar Heat Gain Coefficient (SHGC) is critical for maximizing energy efficiency and achieving your sustainability goals. These metrics determine how well your windows insulate and manage solar heat, directly impacting your home’s energy use and comfort.

U Values

The U Value measures how well a window prevents heat from escaping, which is crucial for thermal efficiency and reducing energy consumption.

  • Lower U Values = Better Insulation: Superior insulation reduces heating and cooling needs, essential for net zero homes.
  • Energy Impact: Low U values significantly lower energy bills and carbon footprint.

Duxton Windows offers advanced low-U-value options with dual or triple-pane glass and high-performance LoĒ coatings​ (Duxton Windows & Doors)​.


Solar Heat Gain Coefficient (SHGC) measures how well a window blocks heat from the sun, vital for passive solar strategies.

  • Lower SHGC = Less Solar Heat: Reducing cooling loads and preventing overheating in summer.
  • Optimizing Light and Heat: Balancing SHGC ensures natural light without excessive heat gain.

Duxton Windows provides various LoĒ coatings for optimal SHGC tailored to different climates and orientations​ (Duxton Windows & Doors)​.

Benefits for Net Zero Homes

  1. Energy Efficiency: Proper U values and SHGC contribute significantly to net zero goals.
  2. Comfort and Health: Consistent indoor climate improves comfort and reduces reliance on artificial heating and cooling.
  3. Environmental Impact: Energy-efficient windows lower energy use, reducing greenhouse gas emissions.


Selecting windows with the right U values and SHGC is key to building a net zero home. Dundela Windows offers high-performance fiberglass windows with high-performance U values designed for maximum energy efficiency and minimal environmental impact. Contact us today to explore our options and take a step towards a greener, more sustainable home.

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