Model
Miele KFNF 9959 iDE
Rank #826 means 825 of the 1,000 refrigerator models we track cost less to run each year; the 45th efficiency percentile means it uses less energy for its size than 45% of those models.
What does the Miele KFNF 9959 iDE cost to run per year?
Not many refrigerator models we track cost more to run than the Miele KFNF 9959 iDE: about $108 a year, rank #826 of 1,000. It uses 11% less energy than the U.S. federal standard model in its class, which would cost about $119/yr to run, a saving of roughly $11 a year. Adjusted for size, it is more efficient than 45% of refrigerator models we track, a middling result. It is a counter-depth model, built shallower to sit flush with kitchen cabinets, a design choice that typically trades away some interior volume (and so some running-cost headroom) for the built-in look.
Immediately around it on the leaderboard, the Liebherr HCB 2091G at $108/yr runs a little cheaper and the Viking Range,Llc FDBMIC7360L at $108/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 KFNF 9959 iDE's $108/yr adds up to roughly $1296 in electricity alone, before purchase price or repairs.
Also sold as: Liebherr HCB 2091G.
By the numbers
The Miele KFNF 9959 iDE 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 $108/yr, here is what the Miele KFNF 9959 iDE 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 KFNF 9959 iDE costs about $1080. That is roughly $110 less than a standard model in its class, which would run closer to $1190 over the same ten years.
How the Miele KFNF 9959 iDE compares
The refrigerator class we track runs from $8 to $149 a year. At $108/yr, it runs about $44 a year above the class median of $64, and it is about $100 a year more than the cheapest refrigerator to run at $8. Against the US federal standard model for its class at about $119/yr, the Miele KFNF 9959 iDE uses 11% less energy.
What drives its running cost
At 18.9 cu ft, the Miele KFNF 9959 iDE is a large refrigerator for its class, which spans 1.2 to 31.7 cu ft with a median of 12.6 cu ft, and larger refrigerator models generally cost more to run than smaller ones in the same class, simply because there is more to keep cold, spin, heat, or light.
- 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 KFNF 9959 iDE cheap to run?
Not especially. At $108 a year it ranks #826 of 1,000 refrigerator models we track, in the pricier part of its class to run, though its size and features may still justify that for your needs.
How much does the Miele KFNF 9959 iDE cost per month?
Roughly $8.97/mo, spreading the $108/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 580 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $108 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Miele KFNF 9959 iDE for its size?
45th percentile once size is factored in. That means its size-adjusted efficiency is not the main reason for the running-cost figure above; its capacity plays a large role too.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 826 | Liebherr HCB 2091G18.9 cu ft | $108 |
| 825 | Fhiaba S360HST6IU19.4 cu ft | $108 |
| 824 | Gaggenau RY49270519.4 cu ft | $107 |
| 823 | Lg LF21G6200*20.8 cu ft | $107 |
| 822 | Ge GDE21EMK****20.9 cu ft | $106 |
Source
ES_31629_KFNF 9959 iDE_121920252120447_9603688View certified refrigerator listingsENERGY STAR data as of July 2026Miele and KFNF 9959 iDE 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.