solar heat collector
hello, i need help on a solar air collector. my furnace was installed about fifteen years ago and it is just now starting to give troube, so i thought instead of putting much more into it, it would be wise to invest in free heat. I just want to know anyones experience with solar heat because i dont know the first thing about these collectors. Someone please explain to me how to install, how they work, how much money, and how effecient these heaters are. I would say they are pretty much maintenance free and very frugal right?