Model
Miele KFN 7784 D
Rank #384 means 383 of the 1,000 refrigerator models we track cost less to run each year; the 42nd efficiency percentile means it uses less energy for its size than 42% of those models.
What does the Miele KFN 7784 D cost to run per year?
Ranking #384 of 1,000, the Miele KFN 7784 D is in the cheaper half of its class to run, at about $56 a year. It uses 31% less energy than the U.S. federal standard model in its class, which would cost about $81/yr to run, a saving of roughly $25 a year. Adjusted for size, it is more efficient than 42% of refrigerator models we track, a middling result. Counter-depth construction, which this model has, generally means a shallower cabinet and less interior volume than a standard-depth model the same width, a tradeoff worth knowing if you are comparing it on cubic feet.
Immediately around it on the leaderboard, the Lg LT13C2000* at $56/yr runs a little cheaper and the Gaggenau RVC467790 at $56/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 Miele KFN 7784 D's $56/yr adds up to roughly $672 in electricity alone, before purchase price or repairs.
By the numbers
The Miele KFN 7784 D 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 $56/yr, here is what the Miele KFN 7784 D adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Miele KFN 7784 D costs about $560. That is roughly $250 less than a standard model in its class, which would run closer to $810 over the same ten years.
How the Miele KFN 7784 D compares
The refrigerator class we track runs from $8 to $149 a year. At $56/yr, it runs about $8 a year cheaper than the class median of $64, and it is about $48 a year more than the cheapest refrigerator to run at $8. Against the US federal standard model for its class at about $81/yr, the Miele KFN 7784 D uses 31% less energy.
What drives its running cost
At 8.9 cu ft, the Miele KFN 7784 D 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.
- 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.
- 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.
- 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 Miele KFN 7784 D cheap to run?
Yes, relatively. At $56 a year it ranks #384 of 1,000 refrigerator models we track, in the cheaper part of its class to run.
How much does the Miele KFN 7784 D cost per month?
Roughly $4.64/mo, spreading the $56/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 300 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $56 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Miele KFN 7784 D for its size?
42nd percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 383 | Lg LT13C2000*13.2 cu ft | $56 |
| 382 | Black+Decker BR1000XS10.5 cu ft | $56 |
| 381 | Wood'S WFF100S9.8 cu ft | $55 |
| 380 | Lg LB12C2000*12.1 cu ft | $55 |
| 379 | Frigidaire FRTE1026AB10.1 cu ft | $55 |
Source
ES_31629_KFN 7784 D_121920252120531_5350658View certified refrigerator listingsENERGY STAR data as of July 2026Miele and KFN 7784 D 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.