Model
Koolmore KM-RERFDSSI-20
Rank #757 means 756 of the 1,000 refrigerator models we track cost less to run each year; the 73rd efficiency percentile means it uses less energy for its size than 73% of those models.
What does the Koolmore KM-RERFDSSI-20 cost to run per year?
The Koolmore KM-RERFDSSI-20 costs about $95 a year to run, more than most of the 1,000 refrigerator models we track; it ranks #757. It uses 20% less energy than the U.S. federal standard model in its class, which would cost about $115/yr to run, a saving of roughly $20 a year. Efficiency-wise, once size is accounted for, it edges out 73% of the class, a modestly above-average showing. This class has no published efficiency-factor figure beyond annual kWh itself, so at 20.3 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 Forno FFFFD1974-31BLK at $95/yr runs a little cheaper and the Thor Kitchen RF3017FFD99 at $95/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 Koolmore KM-RERFDSSI-20's $95/yr adds up to roughly $1140 in electricity alone, before purchase price or repairs.
By the numbers
The Koolmore KM-RERFDSSI-20 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 $95/yr, here is what the Koolmore KM-RERFDSSI-20 adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Koolmore KM-RERFDSSI-20 costs about $950. That is roughly $200 less than a standard model in its class, which would run closer to $1150 over the same ten years.
How the Koolmore KM-RERFDSSI-20 compares
The refrigerator class we track runs from $8 to $149 a year. At $95/yr, it runs about $31 a year above the class median of $64, and it is about $87 a year more than the cheapest refrigerator to run at $8. Against the US federal standard model for its class at about $115/yr, the Koolmore KM-RERFDSSI-20 uses 20% less energy.
What drives its running cost
At 20.3 cu ft, the Koolmore KM-RERFDSSI-20 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.
- 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 Koolmore KM-RERFDSSI-20 cheap to run?
Its $95/yr running cost, rank #757 of 1,000, is above what most refrigerator models we track cost to run, so this is not one of the cheaper picks on electricity alone.
How much does the Koolmore KM-RERFDSSI-20 cost per month?
About $7.92 a month, which is the $95 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: 512 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $95 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Koolmore KM-RERFDSSI-20 for its size?
73rd 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 |
|---|---|---|
| 756 | Forno FFFFD1974-31BLK17.5 cu ft | $95 |
| 755 | Cosmo COS-RFFV183GHS17.5 cu ft | $95 |
| 754 | Liebherr MCB 306114.5 cu ft | $95 |
| 753 | Miele KFN 9855 iDE li14.1 cu ft | $94 |
| 752 | Black Decker BR2400JIMS24 cu ft | $94 |
Source
ES_1147715_KM-RERFDSSI-20_070220260432558_5781384View certified refrigerator listingsENERGY STAR data as of July 2026Koolmore and KM-RERFDSSI-20 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.