As heating bills soar, penny-pinchers are turning to a cheaper source of warmth: woodchips. According to an AP article on the growing woodchip trend, Mount Wachusett Community College campus in Massacusetts started the trend four years ago: Instead of spending the usual half-a-million-dollar annual heating bill, the college ponied up a mere $31,000 for the woodchips, meanwhile reducing its greenhouse gasses 19 percent.