Short Answer
Not necessarily. Performance depends on the complete window specification, including U-factor, SHGC, air leakage, frame, glass configuration, installation, and orientation.
Detailed Explanation
Triple-pane windows add a third pane of glass and a second insulating gas space, which can improve thermal performance. But whether the improvement justifies the additional cost depends on the climate, the home's energy use, and the specific window specification. A well-designed double-pane window with low-E coatings and argon gas can perform nearly as well as a basic triple-pane window. The key metrics to compare are U-factor (insulation performance) and SHGC (solar heat gain), not just the number of panes. In South Jersey's moderate climate, high-quality double-pane windows often provide the best balance of performance and cost. Triple-pane may be worth the investment for north-facing windows or homes with very high heating costs.
Why It Matters
Spending more on triple-pane windows without comparing actual performance metrics may not provide a return on the additional investment.