| Window air heaters are a great way to generate | | | | ideas that can generate the same heat without |
| free heat. I have done my research and found | | | | the additional work this design creates. |
| several designs from others who had built their | | | | First you have to drill a hole into each can so the |
| window units with everything from soda cans to | | | | air can pass through and up into the top of the |
| aluminum sheet metal to straight wood boxes. | | | | unit. This seems like a great deal of work when |
| Everyone one uses the same principal; build an | | | | there are other inexpensive materials you can |
| enclosed box with a glass or plexi-glass front, add | | | | use. I used plastic French drain pipe for my heater |
| an inexpensive material, paint it black and you | | | | and it works great. It runs about.45 per foot and |
| have a window air heater that generates warm | | | | is relatively easy to work with. It already was |
| air from sunlight. | | | | hollow and allowed the warm air to travel freely. |
| As cold air feeds the bottom of the unit, it | | | | With the soda can design you have to still paint |
| warms and travels up through the black space | | | | each can black to get the maximum absorption of |
| toward the top. On the way, the light entering the | | | | sunlight. My French drain pipe already was made |
| box begins to increase the air temperature. As | | | | of black plastic, so this step was not needed. |
| the air heats up, it gets lighter and travels upward | | | | In summary, creating a window air heat system |
| which can exits the unit and can be piped in | | | | that generates warm air from sunlight is easy and |
| through the window. | | | | inexpensive to do. The soda can design works ok, |
| Many have used soda or beer cans to build their | | | | but I believe there are alternative designs and |
| heat chamber. After reviewing the steps and | | | | materials that can save you time and effort and |
| thinking it through, I have come across other | | | | generate as much heat as you need. |