Make sure your refrigerator door seals are airtight. Test them by closing the door over a piece of paper or a dollar bill so it is half in and half out of the refrigerator. If you can pull the paper or bill out easily, the latch may need adjustment or the seal may need replacing.
There are no easy ways to improve your credit score, but you can work to keep it acceptable by maintaining a good credit history. This means paying your bills on time and not overextending yourself by buying more than you can afford.