5. Make sure refrigerator seals are tight.
Cost-Saving Estimate: $25/year
Test your refrigerator door seal by closing the door on a dollar bill and slowly pulling it out. If there’s no resistance, your fridge could be leaking cool air. You may also see discoloration or cracks in the seal. To improve your fridge’s efficiency and extend its lifespan, replace this leaky seal, known as a gasket, with a new one.