3. Keep the chill box chilled
Refrigerators use lots of energy – even a modern ENERGY STAR certified fridge uses about 350 kWh annually. Take steps to prevent yours from working overtime: set the temperature to 3°C (37°F) and make sure the seal is airtight. Try closing the door on a piece of paper; if it slips out, replace the seal. And tell Uncle Frank where the mustard is, so he doesn’t stand with the fridge door open, letting cold air escape.