Window Spacers - What's the difference?

When it comes to the energy-efficiency of a multi-pane window, do window spacers really make that much of a difference?

Energy Star product specification comparisons

Window Spacers - What's the difference?

2 Main Types of Soundproof Glass

Window Grilles DIY Reference, Reliable and Energy Efficient Doors and Windows, grille

Window Grilles DIY Reference, Reliable and Energy Efficient Doors and Windows, grille

Window efficiency by window style

Window efficiency by window style

Not all windows are full of hot air

Energy Star product specification comparisons

Window replacement - To sash or not to sash?

9 basics to consider before shopping for a new door

Infographic - The Protective Properties of Window Glass