Are dual-pane windows necessary in Phoenix?

Dual-pane windows are not absolutely necessary in Phoenix, but they do improve energy efficiency and comfort. They reduce heat transfer, which helps keep cooling costs down during the long summer and provides some benefit during winter. Many newer homes include dual-pane or low-E windows as standard, while older homes often have single-pane. The difference in energy savings varies depending on window size, orientation and how much sun exposure the home gets. Dual-pane windows also reduce outside noise. If a home has single-pane windows, consider the potential cost to upgrade and whether the energy savings and comfort justify the investment for you.