Table 4. Intervention cost-effectiveness.a.
| Interventions | Degree-hour reduction (family profile) |
Capital cost (£) |
Annual space heating energy increment (kWh/year) |
Annual extra cost (£/year) |
Intervention lifespan (years) |
Discounted MAC (£/degree-hour) |
|---|---|---|---|---|---|---|
| Night-purge ventilation | 1408 | – | – | – | 100 | 0.000 |
| Pre-ventilation 2 h | 1017 | – | – | – | 100 | 0.000 |
| Pre-ventilation 1 h | 692 | – | – | – | 100 | 0.000 |
| Cross ventilation | 5 | – | – | – | 100 | 0.000 |
| Internal curtains | 907 | 10030 | 0.5 | 0.01 | 3030 | 0.005 |
| Internal blinds | 787 | 10030 | 0.4 | 0.01 | 3030 | 0.006 |
| Solar control film | 1362 | 6041 | 104.1 | 2.99 | 1041 | 0.007 |
| External shutters | 1524 | 40030 | 1.1 | 0.03 | 2030 | 0.017 |
| Light-colour roof | 533 | 10042 | 24.3 | 0.70 | 1043 | 0.023 |
| Side-hinged window | 415 | 60030 | 3.5 | 0.10 | 2030 | 0.093 |
| Top-hinged window | 298 | 76030 | 2.2 | 0.06 | 2030 | 0.164 |
| Bottom-hinged window | 176 | 52030 | 1.1 | 0.03 | 2030 | 0.190 |
| Light-colour walls | 50 | 41044 | 2.1 | 0.06 | 1043 | 0.941 |
| External wall insulation | 3 | 11,80045 | –8.0 | –0.023 | 10046 | 124.050 |
a
Discounted MAC is calculated individually and ranked; these are then modelled cumulatively to identify the most cost-effective adaptations to eliminate overheating. References for capital costs and life expectancy are shown in brackets. Grey rows indicate interventions that have been selected instead of alternative, conflicting interventions.