Tip #12 of the Ways to Save Money Series is a short and simple one. To save money on cooling your freezer (and refrigerator), keep your freezer as full as possible. This technique is actually called “freezer blocking” and people have made it into a science.
I was looking around for some support of this idea and I found this forum entry on the Saving Advice forums:
Basically freezer blocking is filling up the unused space inside the freezer. The theory is … the less air inside the freezer the less electricity will be required to freeze the food. Anything that lowers the internal volume of the freezer will cause the compressor to spend less time keeping the interior cold. It would be equivalent to having a smaller freezer.
Additionally, the cold air from your freezer goes to your fridge, which is how your fridge is cooled. If you also try to fill up your fridge, your compressor would need to work even less.
The article mentions using cardboard boxes filled with insulation, but that seems a bit over the top for me. Instead, just fill up some used plastic containers with water and fill in the spaces where you can. Also, you’ll have “emergency water” if you ever need it!
I’m not going to claim whether the science behind this is true, but it’s one of those “It makes sense” things and it doesn’t take much to fill up a bottle with water and throw it in a space so I’m up for it.
So, if you can link to or explain the science here, please do! I’m a bit too lazy for that and I’m saving up energy for filling up the bottles and lugging them to the freezer 🙂