*Always Cover liquids and wrap your food that will be stored in the refrigerator because, uncovered foods release moisture and make the compressor work harder.
*Make sure your refrigerator door seals are airtight, you could 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, then the latch may need adjustment, or the seal may need replacing.
*Keep the fridge at least 10cm from the wall, because this will allow the coils to work most efficiently. They should also be dust-free, so vacuum them every few months, but of-course you have to unplug the fridge first.
*If your fridge doesn't defrost automatically, keep an eye on ice and defrost it regularly. A build up of ice will stop your fridge/freezer from working effectively.So don't allow frost to build up more than one-quarter of an inch.