This video shows us an ingenious way to heat a whole room for under 15 cents or possibly even cheaper if you find cheaper candles or maybe larger ones.
It's simple, here's what you need:
Small candles such as the ones seen is the video, which are found at Ikea, A metal cake pan, Two clay planter pots, one smaller than the other, and a lighter to light the candles
This awesome idea works on convection, which is accomplished by the air moving around between the two clay pots. This helps create a forced air effect which pushes the hot air around the room. Watch the video below to see how it's done:
