Model
Insignia NS-RTM18WH7*
Rank #551 means 550 of the 1,000 refrigerator models we track cost less to run each year; the 92nd efficiency percentile means it uses less energy for its size than 92% of those models.
What does the Insignia NS-RTM18WH7* cost to run per year?
The Insignia NS-RTM18WH7* costs about $67 a year to run, a fairly typical figure for the class; it ranks #551 of 1,000. It uses 10% less energy than the U.S. federal standard model in its class, which would cost about $75/yr to run, a saving of roughly $8 a year. Few refrigerator models we track beat it on size-adjusted efficiency; it edges out 92% of the class once capacity is normalized. This class has no published efficiency-factor figure beyond annual kWh itself, so at 18.1 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 Ikea OLOFSFORS 10587608 at $67/yr runs a little cheaper and the Midea MDRT663FGF***** at $67/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 Insignia NS-RTM18WH7*'s $67/yr adds up to roughly $804 in electricity alone, before purchase price or repairs.
Also sold as: Moffat MTE18HTKBB*.
By the numbers
The Insignia NS-RTM18WH7* 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 $67/yr, here is what the Insignia NS-RTM18WH7* adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Insignia NS-RTM18WH7* costs about $670. That is roughly $80 less than a standard model in its class, which would run closer to $750 over the same ten years.
How the Insignia NS-RTM18WH7* compares
The refrigerator class we track runs from $8 to $149 a year. At $67/yr, it runs about $3 a year above the class median of $64, and it is about $59 a year more than the cheapest refrigerator to run at $8. Against the US federal standard model for its class at about $75/yr, the Insignia NS-RTM18WH7* uses 10% less energy.
What drives its running cost
At 18.1 cu ft, the Insignia NS-RTM18WH7* 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 Insignia NS-RTM18WH7* cheap to run?
Roughly, yes. Its $67/yr figure is close to the class median, ranking #551 of 1,000, neither a bargain nor a splurge on running cost.
How much does the Insignia NS-RTM18WH7* cost per month?
About $5.6 a month, which is the $67 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: 362 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $67 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Insignia NS-RTM18WH7* for its size?
92nd percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 550 | Ikea OLOFSFORS 1058760818 cu ft | $67 |
| 549 | Golden BVIREF18W18 cu ft | $67 |
| 548 | Ellipse ERTM180WE18 cu ft | $67 |
| 547 | Bevoi BVIREF18*18 cu ft | $67 |
| 546 | Upstreman BD176-Black17.6 cu ft | $67 |
Source
ES_1059185_NS-RTM18WH7*_12302019065503_8903317View certified refrigerator listingsENERGY STAR data as of July 2026Insignia and NS-RTM18WH7* 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.