Table 4 Payback period evaluation of retrofit scenarios for one average dwelling in the study area.
Retrofit scenario | Unit costs (€/m2) | Heating system cost (€) | Total costs (€) | Energy savings (kWh/year) | Money savings “A” (€/year) | Payback period “A” (years) | Money savings “B” (€/year) | Payback period “B” (years) |
|---|---|---|---|---|---|---|---|---|
SEE | 100 | 7000 | 16,000 | 14,093 | 891 | 18.0 | 493 | 32.4 |
AEE | 130 | 7100 | 18,800 | 14,652 | 926 | 20.3 | 513 | 36.7 |
DEE | 150 | 7100 | 20,600 | 14,967 | 946 | 21.8 | 524 | 39.3 |