Model
Sub-Zero ID-24FI
Rank #200 means 199 of the 622 freezer models we track cost less to run each year; the 5th efficiency percentile means it uses less energy for its size than 5% of those models.
What does the Sub-Zero ID-24FI cost to run per year?
At about $70 a year, the Sub-Zero ID-24FI undercuts most freezer models we track on running cost, rank #200 of 622. It uses 10% less energy than the U.S. federal standard model in its class, which would cost about $78/yr to run, a saving of roughly $8 a year. Capacity-normalized, it ranks ahead of just 5% of freezer models we track, a clearly below-average result. This class has no published efficiency-factor figure beyond annual kWh itself, so at 3.8 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 Sub-Zero ID-24F at $70/yr runs a little cheaper and the Fisher & Paykel RS2474F3**# at $70/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 ID-24FI's $70/yr adds up to roughly $980 in electricity alone, before purchase price or repairs.
Also sold as: Sub-Zero ID-24F.
By the numbers
The Sub-Zero ID-24FI 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 $70/yr, here is what the Sub-Zero ID-24FI 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 ID-24FI costs about $700. That is roughly $80 less than a standard model in its class, which would run closer to $780 over the same ten years.
How the Sub-Zero ID-24FI compares
The freezer class we track runs from $25 to $120 a year. At $70/yr, it runs about $5 a year cheaper than the class median of $75, and it is about $45 a year more than the cheapest freezer to run at $25. Against the US federal standard model for its class at about $78/yr, the Sub-Zero ID-24FI uses 10% less energy.
What drives its running cost
At 3.8 cu ft, the Sub-Zero ID-24FI is a small freezer for its class, which spans 1.1 to 23 cu ft with a median of 13.8 cu ft, at the small end of the class, capacity itself is doing a lot of the work to keep that figure down, separate from how efficient the unit actually is.
- 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 ID-24FI cheap to run?
Yes. Its $70/yr running cost puts it at rank #200 of 622, below what most freezer models we track cost to run.
How much does the Sub-Zero ID-24FI cost per month?
About $5.83 a month, which is the $70 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: 377 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $70 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Sub-Zero ID-24FI for its size?
5th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 200 | Sub-Zero ID-24F3.8 cu ft | $70 |
| 199 | Marvel MPFZ*24-SS*1A4.6 cu ft | $68 |
| 198 | Marvel MPFZ*24-IS*1A4.6 cu ft | $68 |
| 197 | Marvel MOFZ*24-SS*1A4.6 cu ft | $68 |
| 196 | Marvel MLFZ*24-SS*1A4.6 cu ft | $68 |
Source
ES_0031863_ID-24FI_07032014112231_2742900View certified freezer listingsENERGY STAR data as of July 2026Sub-Zero and ID-24FI 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.