passively heat a house with sunlight.
Passive means no power required. Most solar
heating is based on the 'greenhouse effect'. Short-wave
sunlight passes easily through glass, strikes a dark surface,
transforming into long-wave heat energy which does not easily
pass back out through the glass, causing the inside temperature
to rise. The temperature rises until the heat escaping equals
the light entering. In an insulated solar oven, temperatures
can reach 400 degrees Farenheit or more, hot enough to bake
To use this principle to heat a house, many designs
have been created. Among the simplest is the
glass-covered box which draws cold air from near the floor of a
house, heats it outside in the box and returns it heated near
the ceiling. This circulation causes the temperature in the
room to rise rapidly. To control the temperature and to stop
the circulation, the vents can be either covered with flaps or
covers or stuffed with small pillows or towells. This heater
design is among the least expensive and most efficient heaters
I have encountered.
My DVD describes the construction and
installation of a box-type solar heater, which can be easily
done by anyone who can use simple hand tools.