The Most Energy-Efficient Freezer is... A Chest Freezer?!
That's right. The most energy-efficient type of freezer is a chest freezer. Why is that?
There are two main reasons why chest freezers are more efficient:
1. When the door is opened on a chest freezer, all the cold air stays at the bottom of the chest and does not escape (because hot air rises). With upright freezers, cold air is more likely to escape from the bottom during door openings. This means that chest freezers that are used frequently stay colder with less effort from the compressor.
2. Chest freezers are often made out of plastic material and not stainless steel. Stainless steel conducts heat and is a less effective insulator. This is why chest freezers will often consume less than half of the energy of an upright freezer even if neither is being opened.
Does this mean you should switch to a chest freezer? Not necessarily. There are many good reasons why upright freezers are so popular, ergonomics being one of them. But it does mean that if you have a chest freezer - even if it's a really old chest freezer - it's likely using very little energy compared to a new upright model. If it still works, and you're still using it, hang onto it and show it some love for quietly doing its job as efficiently as possible [it's Valentine's Day, we couldn't resist ;)].