The windows on an average house here in the United States are responsible for about 50% of the building's heat gain during the summer and 50% of its loss in the winter. Anyone interested in solar heating and/or cooling a residence, then, would be wise to pay particular attention to making the windows on his or her home do exactly what he or she wants them to do. Luckily, some rather minor changes can be made to windows to markedly improve their thermal performance.
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