Yes. Heating and cooling account for 50-70 percent of the yearly energy use in a typical home. Consider that a drafty window is essentially a window that is partially open, and a drafty door is basically a door that’s ajar and its easier to see how over the course of a year a great deal of heat can travel through these openings, each fraction of which must be counteracted by (very expensive) heating and cooling methods by the person living in that home.
Yes faulty doors and windows are an important issue in energy consumption. If your door is drafty then expect your energy bills to be higher due to air being allowed to pass through into and out of the home.
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