Rock Doc

The laws of physical science teach us we can neither create nor destroy energy. But it’s also a simple fact that we can surely waste it. And that raises the possibility of saving money by refusing to let energy slip through our fingers.

Typical families in the U.S. spend about $1,900 each year on home utility bills. That’s $160 per month. Your bills may be higher if your household consumes a lot of energy, if you heat with oil or if you live where the cost of electrical power is high.

Those of us lucky enough to still own a place to live are in the best position to save substantial amounts of...