Freezer Blocking

Freezer Blocking

Lastly, if you're not using all of the space in the freezer, you can try "freezer blocking." Basically, freezer blocking means filling up any unused space inside the freezer, as the less air inside the freezer, the less electricity required. The theory is that the compressor will spend less time and, therefore, energy keeping the interior cold.

To freezer block, simply take empty cardboard boxes and fill them with leftover wall insulation. Any form of insulation can do the trick, but most folks stick to basic household wall insulation (fiberglass), as it's both inexpensive and easy to get. You can also use the insulating Styrofoam peanuts used for shipping and packaging, although those aren't environmentally friendly. Once the boxes are completely filled, seal them shut with tape and place them in the empty areas of the freezer.

Since freezer blocking hasn't been scientifically tested, the only evidence that it's working will be your electricity bill. Give it a couple months, and if it is working, you'll probably warm up to the idea of freezer blocking. Otherwise, you'll have some pretty chilly boxes on hand, which may work as cold compresses if you're running low on frozen peas.