Your refrigerator might be working harder than it needs to. Like your carpets and furniture, your fridge’s condenser coils are often an overlooked area that needs to be cleaned and dusted. Start by unplugging or turning your fridge off from the circuit breaker. Locate the coils, either in the front or back of the fridge. Use a brush to clean them and vacuum when done. And don’t forget to plug your fridge back in!
https://www.masssave.com/en/learn/blog/residential/giving-your-home-a-spring-cleanup