Model
Perfect Aire 4PFD35
Rank #305 means 304 of the 519 dehumidifier models we track cost less to run each year; the 53rd efficiency percentile means it uses less energy for its size than 53% of those models.
What does the Perfect Aire 4PFD35 cost to run per year?
The Perfect Aire 4PFD35 costs about $71 a year to run, a middle-of-the-pack figure at rank #305 of 519. Once capacity is factored in, its efficiency percentile of 53 is fairly typical for the class, neither a standout nor a laggard. At a IEF of 2.01, its integrated energy factor is the single figure that best explains how it earns its running-cost number.
Immediately around it on the leaderboard, the Coolworks TDUDPA-35AEN8-BB0 at $71/yr runs a little cheaper and the Waykar; Kesnos; Yaufey; Fehom YDA-120 at $71/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 Perfect Aire 4PFD35's $71/yr adds up to roughly $568 in electricity alone, before purchase price or repairs.
Also sold as: Coolworks TDUDPA-35AEN8-BB0.
By the numbers
The Perfect Aire 4PFD35 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 $71/yr, here is what the Perfect Aire 4PFD35 adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Perfect Aire 4PFD35 costs about $710. That is roughly $70 more than the class median, which would run closer to $640 over the same ten years.
How the Perfect Aire 4PFD35 compares
The dehumidifier class we track runs from $19 to $521 a year. At $71/yr, it runs about $7 a year above the class median of $64, and it is about $52 a year more than the cheapest dehumidifier to run at $19.
What drives its running cost
At 36.18 pints/day, the Perfect Aire 4PFD35 is a mid-size dehumidifier for its class, which spans 1.91 to 172.13 pints/day with a median of 32.46 pints/day, neither the size advantage of a small unit nor the size penalty of a large one applies here, so its running cost is a fairer test of efficiency alone. Its IEF of 2.01, above the class median of 2.01, reflects integrated 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.
- 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 Perfect Aire 4PFD35 cheap to run?
It is about average. At $71 a year it ranks #305 of 519 dehumidifier models we track, close to the middle of its class on running cost.
How much does the Perfect Aire 4PFD35 cost per month?
Roughly $5.91/mo, spreading the $71/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 382 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $71 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Perfect Aire 4PFD35 for its size?
53rd percentile once size is factored in, a fairly typical result for the class.
Cheaper to run in the same class
Source
ES_1121980_4PFD35_082620250019103_1830813View certified dehumidifier listingsENERGY STAR data as of July 2026Perfect Aire and 4PFD35 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.