Window replacement
Heat loss old vs new + payback
Input
Savings/yr
replacement: 72 000 ₴
4 537 ₴/yr
- Heat saved
- 1 745 кВт·год
- Payback
- 15,9 yrs
U-values: single glass ~5.0, old double-glaze 2.8, new double 1.1, triple with i-glass 0.7. ΔT ~22°C average over heating season. Payback 8–15 years — windows are about comfort and condensation too, not just savings.