Experiment energy efficiency retrofits | Ventilation scenarios | ||
---|---|---|---|
Regulation | Installer discretion | No added ventilation | |
Number of retrofits installed (1000s) | |||
Loft insulation | 5320 | 5320 | 5320 |
Cavity wall insulation | 6560 | 6560 | 6560 |
Solid wall insulation | 5700 | 5700 | 5700 |
Double glazing installation | 2430 | 2430 | 2430 |
Condensing boiler installation | 10 730 | 10 730 | 10 730 |
Gas central heating installation | 310 | 310 | 310 |
Draught proofing | 3870 | 3870 | 3870 |
Trickle vent and extract fans | 15 280 | 900 | 0 |
Extract fan installation only | 350 | 350 | 0 |
Extract fan refurbishment | 50 | 50 | 50 |
Trickle vent installation only | 270 | 270 | 0 |
Note that trickle and extract fans include all new installations, extract fan only already have trickle vents, trickle only already have extract fans.