Model
Sub-Zero ID-30F
Rank #191 means 190 of the 622 freezer models we track cost less to run each year; the 12th efficiency percentile means it uses less energy for its size than 12% of those models.
What does the Sub-Zero ID-30F cost to run per year?
Among the 622 freezer models we track, the Sub-Zero ID-30F sits in the below-average-cost group, rank #191, at roughly $66 a year. It uses 20% less energy than the U.S. federal standard model in its class, which would cost about $82/yr to run, a saving of roughly $16 a year. Size-adjusted, this model ranks near the bottom of its class on efficiency, ahead of just 12% of freezer models we track. This class has no published efficiency-factor figure beyond annual kWh itself, so at 5.1 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 Vissani MDUF11**6 at $66/yr runs a little cheaper and the Samsung RZ11M7074** at $67/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-30F's $66/yr adds up to roughly $924 in electricity alone, before purchase price or repairs.
By the numbers
The Sub-Zero ID-30F 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 $66/yr, here is what the Sub-Zero ID-30F 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-30F costs about $660. That is roughly $160 less than a standard model in its class, which would run closer to $820 over the same ten years.
How the Sub-Zero ID-30F compares
The freezer class we track runs from $25 to $120 a year. At $66/yr, it runs about $9 a year cheaper than the class median of $75, and it is about $41 a year more than the cheapest freezer to run at $25. Against the US federal standard model for its class at about $82/yr, the Sub-Zero ID-30F uses 20% less energy.
What drives its running cost
At 5.1 cu ft, the Sub-Zero ID-30F is a small freezer for its class, which spans 1.1 to 23 cu ft with a median of 13.8 cu ft, less capacity to service is usually the first reason a running-cost figure lands on the low side, before efficiency even enters the picture.
- 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-30F cheap to run?
Yes. Its $66/yr running cost puts it at rank #191 of 622, below what most freezer models we track cost to run.
How much does the Sub-Zero ID-30F cost per month?
About $5.51 a month, which is the $66 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: 356 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $66 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Sub-Zero ID-30F for its size?
12th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 190 | Vissani MDUF11**611 cu ft | $66 |
| 189 | Vissani MDUF11**511 cu ft | $66 |
| 188 | Summit ADFD2D243.5 cu ft | $66 |
| 187 | Insignia NS-UZ11**27-C11 cu ft | $66 |
| 186 | Insignia NS-UZ11**2711 cu ft | $66 |
Source
ES_0031863_ID-30F_04302014021437_2723809View certified freezer listingsENERGY STAR data as of July 2026Sub-Zero and ID-30F 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.