Model
Thermador T36IF900SP
Rank #580 means 579 of the 622 freezer models we track cost less to run each year; the 70th efficiency percentile means it uses less energy for its size than 70% of those models.
What does the Thermador T36IF900SP cost to run per year?
Among the 622 freezer models we track, the Thermador T36IF900SP's $101/yr running cost ranks it #580, in the pricier fifth of the class. It uses 22% less energy than the U.S. federal standard model in its class, which would cost about $127/yr to run, a saving of roughly $26 a year. Its size-adjusted efficiency percentile of 70 is comfortably above the class median. This class has no published efficiency-factor figure beyond annual kWh itself, so at 19.4 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 Miele F 2911 Vi at $101/yr runs a little cheaper and the Dacor DRZ30980*** at $102/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 Thermador T36IF900SP's $101/yr adds up to roughly $1414 in electricity alone, before purchase price or repairs.
Also sold as: Gaggenau RF491704.
By the numbers
The Thermador T36IF900SP 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 $101/yr, here is what the Thermador T36IF900SP adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Thermador T36IF900SP costs about $1010. That is roughly $260 less than a standard model in its class, which would run closer to $1270 over the same ten years.
How the Thermador T36IF900SP compares
The freezer class we track runs from $25 to $120 a year. At $101/yr, it runs about $26 a year above the class median of $75, and it is about $76 a year more than the cheapest freezer to run at $25. Against the US federal standard model for its class at about $127/yr, the Thermador T36IF900SP uses 22% less energy.
What drives its running cost
At 19.4 cu ft, the Thermador T36IF900SP is a large freezer for its class, which spans 1.1 to 23 cu ft with a median of 13.8 cu ft, among freezer models, bigger capacity is the most common reason a running-cost figure lands on the high side, all else being equal.
- 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 Thermador T36IF900SP cheap to run?
Its $101/yr running cost, rank #580 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 Thermador T36IF900SP cost per month?
About $8.4 a month, which is the $101 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: 543 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $101 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Thermador T36IF900SP for its size?
70th percentile once size is factored in. That means its size-adjusted efficiency is a real factor in the running-cost figure above; its capacity plays a large role too.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 583 | Miele F 2911 Vi19.4 cu ft | $101 |
| 582 | Miele F 2911 SF19.4 cu ft | $101 |
| 581 | Miele F 2901 Vi19.4 cu ft | $101 |
| 580 | Gaggenau RF49170419.4 cu ft | $101 |
| 579 | Gaggenau RVF49779022.3 cu ft | $99 |
Source
ES_0031649_T36IF900SP_03082017044344_70122368View certified freezer listingsENERGY STAR data as of July 2026Thermador and T36IF900SP 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.