After all, relying solely on your home's heating ... rotting wood. In addition, high humidity in your crawl space may attract pests and impact your indoor air quality. Even with your vents closed ...

SAVE ENERGY & COST: With these ceiling vent covers, effectively help you eliminate drafts into unused spaces in your home, and also significantly reduce the heating and air conditioning costs ...

Naturally, the solution was to construct a homemade wood furnace ... to weld some external frames for the furnace, as well as a chimney stack, some nifty covers joined by hinges, and a fan ...