I did the math for my parents once for their 50+-year-old freezer using a Kill-A-Watt. Buying a similar, cheap, efficient modern freezer for paid for itself aft

I did the math for my parents once for their 50+-year-old freezer using a Kill-A-Watt. Buying a similar, cheap, efficient modern freezer for paid for itself after 12 years, with an expected life of 11 years. Of course, this was almost a decade ago, so the numbers might have changed; and a newer device would have an automatic defroster.