Passive Solar Heating
Passive solar heating is direct heating of an object the Sun’s rays.
Greenhouses are an example of passive solar heating. Solar radiation
passes through the glass is used by the plants for photosynthesis. But
the some of the sunlight is converted to heat and so the inside of the
greenhouse automatically warms up. Solariums are another example of
this.

Passive Solar Home Design
Solar heating begins at home and can be incorporated into a new house
at little or no extra cost. By using the differences between the high
summer sun compared with the low winter sun, your house can be kept
warmer in winter and cooler in summer.

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