In the winter, heat losses occur when heated air leaks out of the house. Energy must then be spent warming the cool air that replaces it. Energy waste can be cut by the proper installation of windows and doors. Homeowners can save on their utility bills by reducing infiltration around windows and doors. Additional air infiltration occurs around chimneys, electrical outlets, and light switches.
Infiltration is a problem in both the summer and the winter.
Over half of heating and cooling needs are not due to air exchange. Inferring requires that you make logical conclusions from information given. This requires careful reading and organization of ideas presented. Another skill that is helpful in reading comprehension is the development of generalizations. A generalization states an idea that is true for all information presented.