Model
Sub-Zero DEC3050FI/*
Rank #588 means 587 of the 622 freezer models we track cost less to run each year; the 35th efficiency percentile means it uses less energy for its size than 35% of those models.
What does the Sub-Zero DEC3050FI/* cost to run per year?
Among the 622 freezer models we track, the Sub-Zero DEC3050FI/*'s $104/yr running cost ranks it #588, in the pricier fifth of the class. It uses 10% less energy than the U.S. federal standard model in its class, which would cost about $114/yr to run, a saving of roughly $10 a year. Efficiency-wise, once size is accounted for, it trails most of the class, ahead of only 35% of the models we track. This class has no published efficiency-factor figure beyond annual kWh itself, so at 15.5 cu ft (the class spans 1.1 to 23), size is the clearest lever we can point to for this model's running cost.
Immediately around it on the leaderboard, the Sks SKSCF3001* at $102/yr runs a little cheaper and the Gaggenau RF471701 at $105/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A freezer typically stays in service for somewhere around 14 years; over that span, the Sub-Zero DEC3050FI/*'s $104/yr adds up to roughly $1456 in electricity alone, before purchase price or repairs.
By the numbers
The Sub-Zero DEC3050FI/* normalized against its whole class, so each figure means something.
What it costs you over time
Running cost is an every-year number, so it compounds. At $104/yr, here is what the Sub-Zero DEC3050FI/* adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Sub-Zero DEC3050FI/* costs about $1040. That is roughly $100 less than a standard model in its class, which would run closer to $1140 over the same ten years.
How the Sub-Zero DEC3050FI/* compares
The freezer class we track runs from $25 to $120 a year. At $104/yr, it runs about $29 a year above the class median of $75, and it is about $79 a year more than the cheapest freezer to run at $25. Against the US federal standard model for its class at about $114/yr, the Sub-Zero DEC3050FI/* uses 10% less energy.
What drives its running cost
At 15.5 cu ft, the Sub-Zero DEC3050FI/* is a mid-size freezer for its class, which spans 1.1 to 23 cu ft with a median of 13.8 cu ft, neither the size advantage of a small unit nor the size penalty of a large one applies here, so its running cost is a fairer test of efficiency alone.
- Interior volume. As with refrigerators, more cubic feet of frozen storage generally means a bigger compressor and a higher annual energy figure.
- Insulation and defrost type. Better-insulated cabinets lose less cold to the surrounding room, and frost-free (automatic-defrost) freezers run a periodic heating element that a manual-defrost model does not.
- Chest vs upright design. Door orientation affects how much cold air escapes per opening: top-opening chest designs generally hold cold better than front-opening upright ones.
Common questions
Is the Sub-Zero DEC3050FI/* cheap to run?
Its $104/yr running cost, rank #588 of 622, is above what most freezer models we track cost to run, so this is not one of the cheaper picks on electricity alone.
How much does the Sub-Zero DEC3050FI/* cost per month?
About $8.68 a month, which is the $104 annual estimate spread across twelve months at the US average rate of $0.1856/kWh. Your own bill scales with your local electricity rate and how heavily you use it.
How is this running-cost figure calculated?
The formula is annual kWh times price per kWh: 561 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $104 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Sub-Zero DEC3050FI/* for its size?
35th percentile once size is factored in. That means its size-adjusted efficiency is not the main reason for the running-cost figure above; its capacity plays a large role too.
Cheaper to run in the same class
Source
ES_0031863_DEC3050FI/*_09262022111806_80141551View certified freezer listingsENERGY STAR data as of July 2026Sub-Zero and DEC3050FI/* are used here for identification only and are not endorsements. Figures are computed by WattWise Labs from public ENERGY STAR data, not measured in our own lab.