Model
Knka Pro PD30MA-20
Rank #71 means 70 of the 519 dehumidifier models we track cost less to run each year; the 10th efficiency percentile means it uses less energy for its size than 10% of those models.
What does the Knka Pro PD30MA-20 cost to run per year?
At $43 a year to run, the Knka Pro PD30MA-20 is among the cheapest dehumidifier models we track, ranking #71 of 519. Once capacity is factored in, its efficiency percentile of 10 is among the lowest in its class. At a IEF of 1.7, 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 Knka PD30MA-20 at $43/yr runs a little cheaper and the Alorair Sentinel Pro35X at $45/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 Knka Pro PD30MA-20's $43/yr adds up to roughly $344 in electricity alone, before purchase price or repairs.
Also sold as: Knka PD30MA-20.
By the numbers
The Knka Pro PD30MA-20 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 $43/yr, here is what the Knka Pro PD30MA-20 adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Knka Pro PD30MA-20 costs about $430. That is roughly $210 less than the class median, which would run closer to $640 over the same ten years.
How the Knka Pro PD30MA-20 compares
The dehumidifier class we track runs from $19 to $521 a year. At $43/yr, it runs about $21 a year cheaper than the class median of $64, and it is about $24 a year more than the cheapest dehumidifier to run at $19.
What drives its running cost
At 18.5 pints/day, the Knka Pro PD30MA-20 is a small dehumidifier for its class, which spans 1.91 to 172.13 pints/day with a median of 32.46 pints/day, less capacity to service is usually the first reason a running-cost figure lands on the low side, before efficiency even enters the picture. Its IEF of 1.7, below 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 Knka Pro PD30MA-20 cheap to run?
Yes, relatively. At $43 a year it ranks #71 of 519 dehumidifier models we track, in the cheaper part of its class to run.
How much does the Knka Pro PD30MA-20 cost per month?
Roughly $3.56/mo, spreading the $43/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 230 kWh from ENERGY STAR and multiply it by the US average residential electricity rate of $0.1856/kWh, giving about $43 a year. It is an electricity-only estimate and does not include purchase price, water, or installation.
How efficient is the Knka Pro PD30MA-20 for its size?
10th percentile once size is factored in. That means its size-adjusted efficiency is not the main reason for the running-cost figure above; its capacity plays a large role too.
Cheaper to run in the same class
Source
ES_1151630_PD30MA-20_06292026130856_5779019View certified dehumidifier listingsENERGY STAR data as of July 2026Knka Pro and PD30MA-20 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.