What is the total energy cost savings of re-glazing over a 30-year period?

To determine the total energy cost savings of re-glazing over a 30-year period, it is essential to consider the annual energy cost savings achieved through improved insulation and energy efficiency provided by re-glazing windows.

Re-glazing can enhance thermal performance, reduce heat loss during winter, and minimize heat gain during summer, leading to lower heating and cooling costs for a building. By multiplying the annual savings by 30 years, one can calculate the cumulative savings over that period.

If option B represents $36,000, this suggests that the calculated annual savings from re-glazing, when projected over three decades, adds up to this specific amount. This figure reflects a realistic estimate based on typical energy costs, the efficiency improvements of modern glazing technologies, and the expected longevity of the improved windows.

Assessing the other provided figures indicates that they may not align with realistic estimates or projections for energy savings, thus affirming that $36,000 is the most plausible total energy cost savings for the 30-year timeframe described.