|
| Space heating (Gas) kWh/m2/year | Electricity kWh/m2/year | Total energy kWh/m2/year | Air quality (CO2) | Comment |
| Display energy certificate (DEC) | 248 | 58 | 306 | N/A |
|
| Base case IES Apache simulation | 279 | 36 | 315 | >1500 ppm | Insufficient internal air quality (IAQ) |
| IES intervention 1 automatic single glazed existing windows | 195 | 36 | 231 | 1441 ppm
| Meets BB101 requirements Energy saving is 27% |
| IES intervention 2 automatic top double glazed windows | 165 | 36 | 201 | 1437 ppm
| Slightly better IAQ than 1 Energy saving is 36% |
| IES intervention 3 automatic bottom double glazed windows | 164 | 36 | 200 | 1445 ppm | Slightly worse IAQ than 1 & 2; Energy saving is 36% |
| IES intervention 4 automatic top double glazed windows with low level air vents | 183 | 36 | 219 | 1307 ppm | Better IAQ than 1,2,3, 5, & 7; Energy saving is 30% |
| IES intervention 5 automatic mixed double glazed windows | 162 | 36 | 198 | 1446 ppm | Similar IAQ to 1 & 2 Energy saving is 37% |
| IES intervention 6 automatic double glazed parallel opening windows | 212 | 36 | 248 | 1024 ppm | Excellent air quality Energy saving is 21% |
| IES intervention 7 automatic top double glazed windows and a plenum | 263 | 36 | 299 | 1328 ppm | Good air quality Energy saving is 5% |
| IES intervention 8 automatic top double glazed windows with a rooflight | 253 | 36 | 289 | 943 ppm | The best air quality. Energy saving is 8% |