How to make a free passive solar window heater. Get free heat from the sun. With no moving parts to wear out, this homemade heater can last a lifetime. With no other source of heat, on a sunny winter day, the inside of my 32 foot trailer can be 20 degrees or more warmer than outside. On a 39 degree sunny day, it is usually in the 50s or 60s inside. In the 40s outside and it is in the 60s easily inside.<br /><br />This little homemade heater can be put together in just a few minutes and you can immediately start to benefit from the free heat.<br /><br />For instructions and full plans, see <br />http://www.thediyworld.com/DIY-Passive-Solar-Heating-Projects.html
