Solar Air Heating
Solar air heaters not only can reduce your heating bills significantly (usually 20-30%), they can also help improve the indoor air quality by reducing humidity, increasing exterior fresh-air intake and air filtering.
High demand of these products due to rising heat costs will probably cause delays in deliveries for most of these products, order on time!
Tax credits for solar air heaters are available in many states. More info – USA: DSIRE.org