Our study found that office workers performed just the same, whether the air conditioning was set at 22°C or 25°C. But making that tweak can cut energy use by 18%.
The CO2 we produce when we put up buildings is large and virtually unregulated.
Boosting state support for energy efficiency would be a fairer way to reduce bills.
The law says that newly built houses should have a six-star energy rating, to help residents afford their heating and cooling bills. But some builders seem to be findings ways around this requirement.