Anthony Fox of Annapolis wants to know if he has really cut his home energy use or just benefited from milder weather. He needs data. "Is there a public website [with] this info? " Yes: http://bit.ly/YK718 Click on "Preliminary monthly climate data," the place and months you need, then "Go." Compare your energy use with changes in weather-related demand using "heating degree-days" in Col. 6A.