Washington, February 16: Gwyneth Paltrow and hubby Chris Martin may have shown their support for the green campaigns, but a recent survey claimed that their London mansion was "leaking" energy.

According to the Times of London, an audit of properties assessing heat loss found the pair's home in Belize Park bared either worse or no better results as compared to an average family house.

Thermal images of the residence revealed that 1,020 kilowatt hours of heat per year trickled its way out of their residence, reports Fox News.

While the actress has campaigned for the "Act Green" energy conservation, her rocker better half has previously made efforts to make up for CO2 emissions by planting a forest of mango trees in India.

Other high-profile house-owners surveyed in England included Boris Johnson, the mayor of London, and Sir David Attenborough, a broadcaster. (ANI)