Model
Lg Signature WM9901H*A
Rank #168 means 167 of the 388 washing machine models we track cost less to run each year; the 95th efficiency percentile means it uses less energy for its size than 95% of those models.
What does the Lg Signature WM9901H*A cost to run per year?
The Lg Signature WM9901H*A costs about $20 a year to run, a middle-of-the-pack figure at rank #168 of 388. Efficiency-wise, once its capacity is accounted for, it edges out 95% of the class, about as strong a result as this ranking produces. At a IMEF of 3.2, its integrated modified energy factor is the single figure that best explains how it earns its running-cost number.
Immediately around it on the leaderboard, the Lg Signature WM9900H*A at $20/yr runs a little cheaper and the Lg Signature WM9998H*A at $20/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A washing machine typically stays in service for somewhere around 10 years; over that span, the Lg Signature WM9901H*A's $20/yr adds up to roughly $200 in electricity alone, before purchase price or repairs.
Also sold as: Lg Signature WM9700H*A.
By the numbers
The Lg Signature WM9901H*A 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 $20/yr, here is what the Lg Signature WM9901H*A 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 Signature WM9901H*A costs about $200. That is roughly $0 less than the class median, which would run closer to $200 over the same ten years.
How the Lg Signature WM9901H*A compares
The washing machine class we track runs from $7 to $58 a year. At $20/yr, it sits right on the class median of $20, and it is about $13 a year more than the cheapest washing machine to run at $7.
What drives its running cost
At 5.8 cu ft, the Lg Signature WM9901H*A is a large washing machine for its class, which spans 1.9 to 6 cu ft with a median of 4.5 cu ft, among washing machine models, bigger capacity is the most common reason a running-cost figure lands on the high side, all else being equal. Its IMEF of 3.2, above the class median of 2.76, reflects integrated modified energy factor: a higher figure means it wrings more useful work out of every kilowatt-hour, so it is the efficiency lever to weigh against raw size.
- Spin and wash efficiency (IMEF). A higher Integrated Modified Energy Factor means the machine wrings more useful washing (and a drier spin) out of every kilowatt-hour and gallon it uses.
- Drum volume. Drum volume sets the ceiling on how much a single cycle can wash, and it is usually the first driver of a washer's per-cycle energy use.
- Water heating. Cycle temperature, more than drum size, is usually what separates a cheap wash cycle from an expensive one on models with an internal water heater.
Common questions
Is the Lg Signature WM9901H*A cheap to run?
It is about average. At $20 a year it ranks #168 of 388 washing machine models we track, close to the middle of its class on running cost.
How much does the Lg Signature WM9901H*A cost per month?
Roughly $1.67/mo, spreading the $20/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 108 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $20 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Lg Signature WM9901H*A for its size?
95th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 169 | Lg Signature WM9900H*A5.8 cu ft | $20 |
| 168 | Lg Signature WM9700H*A5.8 cu ft | $20 |
| 167 | Haier QFW150S*N***2.4 cu ft | $20 |
| 166 | Smeg WM24UWH2.3 cu ft | $20 |
| 165 | Blomberg WM98220SX*2.3 cu ft | $20 |
Source
ES_1118034_WM9901H*A_01162025115211_80239937View certified washing machine listingsENERGY STAR data as of July 2026Lg Signature and WM9901H*A 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.