Model
Jennair JDAF3924RX
Rank #373 means 372 of the 709 dishwasher models we track cost less to run each year; the 35th efficiency percentile means it uses less energy for its size than 35% of those models.
What does the Jennair JDAF3924RX cost to run per year?
The Jennair JDAF3924RX holds rank #373 of 709 on running cost, at about $45 a year, an unremarkable but typical figure for the class. It uses 21.8% less energy than the U.S. federal standard model in its class, which would cost about $57/yr to run, a saving of roughly $12 a year. Efficiency-wise, once size is accounted for, it trails most of the class, ahead of only 35% of the models we track. This class has no published efficiency-factor figure beyond annual kWh itself, so at 12 place settings (the class spans 2 to 18), size is the clearest lever we can point to for this model's running cost.
Immediately around it on the leaderboard, the Janska JDW-2400 at $45/yr runs a little cheaper and the Jennair JDAF5924RL at $45/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A dishwasher typically stays in service for somewhere around 9 years; over that span, the Jennair JDAF3924RX's $45/yr adds up to roughly $405 in electricity alone, before purchase price or repairs.
Also sold as: Amana ADFS2524R**.
By the numbers
The Jennair JDAF3924RX 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 $45/yr, here is what the Jennair JDAF3924RX adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Jennair JDAF3924RX costs about $450. That is roughly $120 less than a standard model in its class, which would run closer to $570 over the same ten years.
How the Jennair JDAF3924RX compares
The dishwasher class we track runs from $15 to $45 a year. At $45/yr, it runs about $1 a year above the class median of $44, and it is about $30 a year more than the cheapest dishwasher to run at $15. Against the US federal standard model for its class at about $57/yr, the Jennair JDAF3924RX uses 21.8% less energy.
What drives its running cost
At 12 place settings, the Jennair JDAF3924RX is a small dishwasher for its class, which spans 2 to 18 place settings with a median of 14 place settings, at the small end of the class, capacity itself is doing a lot of the work to keep that figure down, separate from how efficient the unit actually is.
- Place-setting capacity. Place-setting capacity is the main driver of how much water a cycle has to heat, and heating that water is most of a dishwasher's electricity use.
- Water heating. Most dishwashers have a booster heater that raises incoming water to sanitizing temperature; this heating step, not the pump or motor, accounts for most of a cycle's electricity use.
- Cycle length and drying method. Heavy or sanitize cycles run longer and hotter than a normal or eco cycle, and heated-dry options cost more to run than air-dry or condensation drying.
Common questions
Is the Jennair JDAF3924RX cheap to run?
Roughly, yes. Its $45/yr figure is close to the class median, ranking #373 of 709, neither a bargain nor a splurge on running cost.
How much does the Jennair JDAF3924RX cost per month?
About $3.71 a month, which is the $45 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: 240 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $45 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Jennair JDAF3924RX for its size?
35th percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
Source
ES_22856_JDAF3924RX_080920231956843_5474968View certified dishwasher listingsENERGY STAR data as of July 2026Jennair and JDAF3924RX 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.