Model
Wood'S WFF100S
Rank #381 means 380 of the 1,000 refrigerator models we track cost less to run each year; the 46th efficiency percentile means it uses less energy for its size than 46% of those models.
What does the Wood'S WFF100S cost to run per year?
Among the 1,000 refrigerator models we track, the Wood'S WFF100S sits in the below-average-cost group, rank #381, at roughly $55 a year. It uses 10% less energy than the U.S. federal standard model in its class, which would cost about $61/yr to run, a saving of roughly $6 a year. Capacity-normalized, it ranks ahead of 46% of refrigerator models we track, right in the class's middle band. This class has no published efficiency-factor figure beyond annual kWh itself, so at 9.8 cu ft (the class spans 1.2 to 31.7), size is the clearest lever we can point to for this model's running cost.
Immediately around it on the leaderboard, the Lg LB12C2000* at $55/yr runs a little cheaper and the Black+Decker BR1000XS 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 Wood'S WFF100S's $55/yr adds up to roughly $660 in electricity alone, before purchase price or repairs.
By the numbers
The Wood'S WFF100S 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 $55/yr, here is what the Wood'S WFF100S adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Wood'S WFF100S costs about $550. That is roughly $60 less than a standard model in its class, which would run closer to $610 over the same ten years.
How the Wood'S WFF100S compares
The refrigerator class we track runs from $8 to $149 a year. At $55/yr, it runs about $9 a year cheaper than the class median of $64, and it is about $47 a year more than the cheapest refrigerator to run at $8. Against the US federal standard model for its class at about $61/yr, the Wood'S WFF100S uses 10% less energy.
What drives its running cost
At 9.8 cu ft, the Wood'S WFF100S 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. More cubic feet of cold air to maintain generally means a bigger compressor and a higher running-cost figure, even among efficient models.
- Counter depth vs standard depth. Standard-depth models generally offer more interior volume per unit of width than counter-depth models, a tradeoff between built-in looks and cubic feet.
- Compressor technology. How a compressor cycles, full on/off versus a variable-speed inverter design, is one of the biggest hidden differences behind two fridges with similar cubic feet but different running costs.
- Placement and ventilation. Ventilation clearance around the back and top matters more than most owners expect; a fridge starved of airflow runs its compressor longer to hold the same temperature.
Common questions
Is the Wood'S WFF100S cheap to run?
Yes. Its $55/yr running cost puts it at rank #381 of 1,000, below what most refrigerator models we track cost to run.
How much does the Wood'S WFF100S cost per month?
About $4.61 a month, which is the $55 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: 298 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $55 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Wood'S WFF100S for its size?
46th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 380 | Lg LB12C2000*12.1 cu ft | $55 |
| 379 | Frigidaire FRTE1026AB10.1 cu ft | $55 |
| 378 | Vitara VTFR1001ESE10.1 cu ft | $55 |
| 377 | Upstreman TM100-SS10.1 cu ft | $55 |
| 376 | Tcl TRT10T4**10.1 cu ft | $55 |
Source
ES_31682_WFF100S_072920240900967_5556100View certified refrigerator listingsENERGY STAR data as of July 2026Wood'S and WFF100S 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.