The study by the Urban Green Council is set to be released Thursday.
The New York Times says the report also estimated that the energy lost through gaps around the units was linked to about 375,000 to 525,000 tons of carbon dioxide emissions. It said the extra fuel consumption amounted to $130 million to $180 million a year.
The report said that building engineers looked at 11 buildings and all had gaps equivalent to the size of a fist - about 2 to 3 inches.
