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Passive Solar is concept that homeowners can use to reduce the energy required to cool or heat a home. By shielding windows from the sun in summer, uncovering certain windows in the winter, strategically opening windows to maximize airflow through the house, and taking the suns rays into consideration when designing landscaping, energy usage and bills can be drastically reduced. From: http://green.msn.com/Green-Living/Green-Dictionary-Passive-Solar