Model
Lg DLE3420*L
Rank #150 means 149 of the 615 clothes dryer models we track cost less to run each year; the 62nd efficiency percentile means it uses less energy for its size than 62% of those models.
What does the Lg DLE3420*L cost to run per year?
The Lg DLE3420*L costs about $113 a year to run, which beats most of the 615 clothes dryer models we track; it ranks #150. Size-adjusted, this model beats 62% of clothes dryer models we track on efficiency, better than most of its class. Its CEF of 3.94 reflects combined energy factor, one of the class's core efficiency levers.
Immediately around it on the leaderboard, the Lg DLE6480* at $113/yr runs a little cheaper and the Maytag MED7100D*+ at $113/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A clothes dryer typically stays in service for somewhere around 13 years; over that span, the Lg DLE3420*L's $113/yr adds up to roughly $1469 in electricity alone, before purchase price or repairs.
Also sold as: Lg DLE3090*.
By the numbers
The Lg DLE3420*L 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 $113/yr, here is what the Lg DLE3420*L 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 DLE3420*L costs about $1130. That is roughly $0 less than the class median, which would run closer to $1130 over the same ten years.
How the Lg DLE3420*L compares
The clothes dryer class we track runs from $23 to $128 a year. At $113/yr, it sits right on the class median of $113, and it is about $90 a year more than the cheapest clothes dryer to run at $23.
What drives its running cost
At 7.4 cu ft, the Lg DLE3420*L is a small clothes dryer for its class, which spans 3.8 to 9.2 cu ft with a median of 7.4 cu ft, less capacity to service is usually the first reason a running-cost figure lands on the low side, before efficiency even enters the picture. The CEF of 3.94 on this model, above the class median of 3.93, measures combined energy factor; it is the number to compare directly against another model's CEF if capacity is similar.
- Heat source and Combined Energy Factor (CEF). Heat-pump dryers recycle heat instead of generating it fresh with a resistance coil, and typically use meaningfully less electricity per load than a conventional resistance dryer, at the cost of a longer cycle; CEF is the federal figure that captures this.
- Drum capacity. A larger drum can dry a bigger load per cycle, but it also usually needs more energy per cycle to heat the extra air volume.
Common questions
Is the Lg DLE3420*L cheap to run?
Yes. Its $113/yr running cost puts it at rank #150 of 615, below what most clothes dryer models we track cost to run.
How much does the Lg DLE3420*L cost per month?
About $9.39 a month, which is the $113 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: 607 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $113 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Lg DLE3420*L for its size?
62nd percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 196 | Lg DLE6480*7.3 cu ft | $113 |
| 195 | Lg DLE8300*7.3 cu ft | $113 |
| 194 | Lg Signature DLEX9700*9 cu ft | $113 |
| 193 | Lg DLE3580*7.4 cu ft | $113 |
| 192 | Lg DLE3420*7.4 cu ft | $113 |
Source
ES_1118034_DLE3420*L_06302026151300_80307578View certified clothes dryer listingsENERGY STAR data as of July 2026Lg and DLE3420*L 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.