Guardian: Beneath the soaring ceiling of 4PD class, Susie Price is encouraging her year 4 pupils to think about how energy is wasted at Argyle primary school in north London. “What sometimes rattles against the windows?” she asks. There’s a pause before a small voice replies hesitantly:”Is it twigs?” Actually, Price explains, it’s more likely to be wind. The Victorian windows are feeling their age. Paired with those high ceilings and the natural inclination of heat to rise, staff are fighting a …