About 4 percent of total energy used in the United States is lost through windows. Heated windows almost completely stop the loss. It costs to heat window panes, but an overall energy bill could be reduced because you're able to lower the thermostat.  -   David Waller     Quotes
About 4 percent of total energy used in the United States is lost through windows. Heated windows almost completely stop the loss. It costs to heat window panes, but an overall energy bill could be reduced because you're able to lower the thermostat. David Waller
 Energy