Model
Lg LT18SO000S
Rank #572 means 571 of the 1,000 refrigerator models we track cost less to run each year; the 87th efficiency percentile means it uses less energy for its size than 87% of those models.
What does the Lg LT18SO000S cost to run per year?
Ranking #572 of 1,000, the Lg LT18SO000S runs at roughly $68 a year, neither the cheapest nor the priciest in its class. It uses 10% less energy than the U.S. federal standard model in its class, which would cost about $76/yr to run, a saving of roughly $8 a year. Adjusted for its size, it is more efficient than 87% of refrigerator models we track, a strong result once size is taken into account. At 17.9 cu ft, it is a mid-size refrigerator for the class, which runs 1.2 to 31.7 cu ft; size and efficiency are the two levers behind the figure above, and this dataset does not carry a separate efficiency-factor column for this class.
Immediately around it on the leaderboard, the Frigidaire FRTE1835AB at $68/yr runs a little cheaper and the Wood'S WFF180W at $68/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 Lg LT18SO000S's $68/yr adds up to roughly $816 in electricity alone, before purchase price or repairs.
By the numbers
The Lg LT18SO000S 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 $68/yr, here is what the Lg LT18SO000S adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Lg LT18SO000S costs about $680. That is roughly $80 less than a standard model in its class, which would run closer to $760 over the same ten years.
How the Lg LT18SO000S compares
The refrigerator class we track runs from $8 to $149 a year. At $68/yr, it runs about $4 a year above the class median of $64, and it is about $60 a year more than the cheapest refrigerator to run at $8. Against the US federal standard model for its class at about $76/yr, the Lg LT18SO000S uses 10% less energy.
What drives its running cost
At 17.9 cu ft, the Lg LT18SO000S 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, putting it squarely in the middle of the class on the size lever that drives most of the cost.
- 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.
- 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.
- 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 Lg LT18SO000S cheap to run?
It is about average. At $68 a year it ranks #572 of 1,000 refrigerator models we track, close to the middle of its class on running cost.
How much does the Lg LT18SO000S cost per month?
Roughly $5.66/mo, spreading the $68/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 366 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $68 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Lg LT18SO000S for its size?
87th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 571 | Frigidaire FRTE1835AB18.2 cu ft | $68 |
| 570 | Frigidaire FFHT1814YB18.2 cu ft | $68 |
| 569 | Kenmore KKTMR18.2X30-SS18.2 cu ft | $68 |
| 568 | Ge GTE18NSW****18.3 cu ft | $68 |
| 567 | Samsung RT18M62*3**17.6 cu ft | $68 |
Source
ES_1118034_LT18SO000S_12102025100641_80281471View certified refrigerator listingsENERGY STAR data as of July 2026Lg and LT18SO000S 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.