Saving energy > Refrigerating

Free standing appliances positioned in a cool place perform best.
Keep the coils at the back dust free as accumulation of dust on condenser coils can increase energy consumption by up to 30%.
Do not fill more than 3/4 full to allow for circulation of cold air.
Always defrost regularly.
Test the tightness of the door seal on refrigerators and freezers.
If the seal doesn't tightly hold a euro note when the door is closed, it's probably time to adjust or replace the gasket.
Replace old refrigerators. E.g. a refrigerator from the 1980's will cost up to 75 percent more to operate than a new super-efficient model.
Don't put warm products in the refrigerator, let them cool-off outside. This avoids the refrigerator from having to use extra energy to keep the temperature low.
For greatest efficency set refrigerators at 4º and freezers at -18º celsius.