Model
Thermador T30IR905SP
Rank #345 means 344 of the 1,000 refrigerator models we track cost less to run each year; the 97th efficiency percentile means it uses less energy for its size than 97% of those models.
What does the Thermador T30IR905SP cost to run per year?
Ranking #345 of 1,000, the Thermador T30IR905SP is in the cheaper half of its class to run, at about $52 a year. It uses 23% less energy than the U.S. federal standard model in its class, which would cost about $67/yr to run, a saving of roughly $15 a year. Normalized for capacity, it ranks ahead of 97% of refrigerator models we track on efficiency, an exceptional showing for the class. At 16.8 cu ft, it is a mid-size refrigerator for the class, which runs 1.2 to 31.7 cu ft; size and efficiency are the two levers behind the figure above, and this dataset does not carry a separate efficiency-factor column for this class.
Immediately around it on the leaderboard, the Zephyr PRR24C01AS-OD at $52/yr runs a little cheaper and the Liebherr IRB5160 at $52/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A refrigerator typically stays in service for somewhere around 12 years; over that span, the Thermador T30IR905SP's $52/yr adds up to roughly $624 in electricity alone, before purchase price or repairs.
By the numbers
The Thermador T30IR905SP 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 $52/yr, here is what the Thermador T30IR905SP 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 T30IR905SP costs about $520. That is roughly $150 less than a standard model in its class, which would run closer to $670 over the same ten years.
How the Thermador T30IR905SP compares
The refrigerator class we track runs from $8 to $149 a year. At $52/yr, it runs about $12 a year cheaper than the class median of $64, and it is about $44 a year more than the cheapest refrigerator to run at $8. Against the US federal standard model for its class at about $67/yr, the Thermador T30IR905SP uses 23% less energy.
What drives its running cost
At 16.8 cu ft, the Thermador T30IR905SP is a mid-size refrigerator for its class, which spans 1.2 to 31.7 cu ft with a median of 12.6 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. Cubic feet of interior volume is the first thing that scales a fridge's running cost up or down, before compressor quality even enters the picture.
- Counter depth vs standard depth. Counter-depth models sit flush with cabinets but usually hold less interior volume than a standard-depth model of the same width, which can nudge the per-cubic-foot running cost either way.
- Compressor technology. Newer variable-speed (inverter) compressors modulate output instead of cycling fully on and off, which tends to use less energy for the same cooling job than an older fixed-speed compressor.
- Placement and ventilation. A fridge pushed tight against a wall or cabinet, or standing next to an oven or in direct sun, works harder to shed the heat its compressor produces, which can push real-world cost above the published figure.
Common questions
Is the Thermador T30IR905SP cheap to run?
Yes, relatively. At $52 a year it ranks #345 of 1,000 refrigerator models we track, in the cheaper part of its class to run.
How much does the Thermador T30IR905SP cost per month?
Roughly $4.32/mo, spreading the $52/yr estimate evenly across twelve months at $0.1856/kWh. Actual monthly bills swing with your rate and usage pattern.
How is this running-cost figure calculated?
We take the model's published annual energy use of 279 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $52 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Thermador T30IR905SP for its size?
97th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 344 | Zephyr PRR24C01AS-OD5.6 cu ft | $52 |
| 343 | Zephyr PRB24C01CBSG5.6 cu ft | $52 |
| 342 | Xo XOU24BCSFR5.7 cu ft | $52 |
| 341 | Xo XOU24BCGSL5.7 cu ft | $52 |
| 340 | Xo XOU24BCGBSL5.7 cu ft | $52 |
Source
ES_0031649_T30IR905SP_08312020054816_80044911View certified refrigerator listingsENERGY STAR data as of July 2026Thermador and T30IR905SP 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.