Model
Aprilaire E100
Rank #510 means 509 of the 519 dehumidifier models we track cost less to run each year; the 94th efficiency percentile means it uses less energy for its size than 94% of those models.
What does the Aprilaire E100 cost to run per year?
Almost nothing we track in this class costs more to run than the Aprilaire E100: about $152 a year, rank #510 of 519. Adjusted for its ief, it is more efficient than 94% of dehumidifier models we track, a strong result once size is taken into account. The IEF figure of 2.35 on this model captures integrated energy factor, the main efficiency lever ENERGY STAR tracks for this class.
Immediately around it on the leaderboard, the Wellsle YDL24P at $147/yr runs a little cheaper and the Santa Fe 4047300 at $156/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A dehumidifier typically stays in service for somewhere around 8 years; over that span, the Aprilaire E100's $152/yr adds up to roughly $1216 in electricity alone, before purchase price or repairs.
By the numbers
The Aprilaire E100 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 $152/yr, here is what the Aprilaire E100 adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Aprilaire E100 costs about $1520. That is roughly $880 more than the class median, which would run closer to $640 over the same ten years.
How the Aprilaire E100 compares
The dehumidifier class we track runs from $19 to $521 a year. At $152/yr, it runs about $88 a year above the class median of $64, and it is about $133 a year more than the cheapest dehumidifier to run at $19.
What drives its running cost
At 85 pints/day, the Aprilaire E100 is a large dehumidifier for its class, which spans 1.91 to 172.13 pints/day with a median of 32.46 pints/day, among dehumidifier models, bigger capacity is the most common reason a running-cost figure lands on the high side, all else being equal. Beyond size, its IEF of 2.35, above the class median of 2.01, is the class's own efficiency yardstick, integrated energy factor, and it is what separates two similarly sized models with different running costs.
- Integrated Energy Factor (IEF). Two dehumidifiers rated for the same pints per day can carry very different IEF figures, and IEF is what actually separates their running costs.
- Water removal capacity (pints/day). Pints-per-day rating scales with the space it is built for, and that rating is the first driver of how much power the compressor needs.
- Humidistat accuracy. How tightly a humidistat holds its target humidity determines how much of the day the compressor actually runs, on top of the unit's rated capacity and IEF.
Common questions
Is the Aprilaire E100 cheap to run?
Not especially. At $152 a year it ranks #510 of 519 dehumidifier models we track, in the pricier part of its class to run, though its size and features may still justify that for your needs.
How much does the Aprilaire E100 cost per month?
Roughly $12.7/mo, spreading the $152/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 821 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $152 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Aprilaire E100 for its size?
94th percentile once size is factored in. That means its size-adjusted efficiency is a real factor in the running-cost figure above; its capacity plays a large role too.
Cheaper to run in the same class
Source
ES_1061335_E100_012020211154333_9399679View certified dehumidifier listingsENERGY STAR data as of July 2026Aprilaire and E100 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.