Did you know that all of the dust and dirt (and cat fur) that collects under your refrigerator can cause it to work harder to keep everything inside it cool?
To save energy, you should clean off the coils of your fridge every 6 months to a year. This sounds daunting, but it is extremely easy.
Step 1: Buy a universal coil brush. (I got mine at Home Depot near the refrigerators. They are extremely cheap.)
Step 2: Unplug your refrigerator. (Once you get a firm grip on the fridge, you can scoot it forward fairly easily in order to reach the plug. Really, I have no muscles and I was able to move mine with ease.)
Step 3: Open the fridge door and pop off the grate located near the bottom.
Step 4: Use the coil brush to clean the coils that are hidden under your fridge. (I usually can't see the coils, so I just move the brush around blindly and pull out embarrassing amounts of grossness, as pictured below.)
Step 5: Pop the grate back on. This may take a forceful punch to do, but you should be able to feel it snap back into place. Plug your refrigerator back in. Clean off the brush for next time.
Your fridge is one of the biggest energy hogs in your house, so anything you can do to make it run a little easier will save you money!