Green homes in the US are saving twice as much energy as predicted.
That’s according to green building certification programme, Built Green, which says certified homes used up to 40% less electricity than non-certified homes, in many cases doubling estimated improvements.
Researchers analysed data provided by utility Seattle City Light and compared model-based predictions with actual electricity use from a year of occupancy across 746 homes.
The study showed on average, certified homes saved homeowners more than $500 (£380.6) per year in electricity bills and prevented more than half a ton of carbon emissions.
Built Green said many homes saved enough energy to power an electric car for more than a year, supply a 12W LED light bulb continuously for more than 44 years or offset the energy production of more than 13 solar panels.
Leah Missik, Built Green Programme Manager, said: “The savings can translate into greater purchasing power for buyers, allowing them to consider homes with a more expensive up-front cost, knowing they’ll cost less to operate in the long run.”