London, March 12 : Using thermal imaging technology, a team of energy surveyors has determined that the Buckingham Palace tops the list of the "dirty dozen" league of London's most environmentally damaging buildings.

According to a report in the Telegraph, the team labeled the palace "shocking and appalling", the biggest "central heating radiator" in the Capital and gave it a score of 0 out of 10.

"It appears the building is better at heating the air outside than inside," said the report by Navitron, the renewable energy company.

Buckingham Palace, despite being in darkness, is completely lit-up as the thermal image shows snapshot pictures of heat instead of light.

Ian Lucas, from Navitron, was astonished by the leaks at Buckingham Palace which last year spent 2.2 million dollars on utility bills.

"The construction of Buckingham Palace does not lend itself to easily turning it into an `eco-home', and I can't imagine Her Majesty wanting to apply insulation panels either to the inside or the outside of the property," he said.

"However, the main concern for the palace should be its windows - something that could be improved without great expense," he added.

According to Lucas, "Clearly the windows are single-glazed, and I suspect that it would not be acceptable to replace with double-glazing, however improvements in draught-proofing on the windows, and perhaps adding secondary-glazing would significantly reduce heat losses and bills."

"Despite the heavy curtains draped inside during the thermal photography, almost all of the palace's windows demonstrated serious heat loss. Noticeably, some groups of windows look a lot cooler than others. At least Her Majesty apparently turns down the thermostat in unused rooms," he said. (ANI)