Oreck WK15500B Air Refresh Review In 2022: Refreshing Good!

There are many self claim air purifier humidifier models in the market, none more rightly so than Oreck WK15500B Air Refresh. This 2-in-1 Hepa Air Purifier & Ultrasonic Humidifier is a hybrid model with dual sets of features that are squeezed inside one tower's body. Perfect for a person that needs air purifying and humidifying both at the same time. So what are the drawbacks of Oreck WK15500B in terms of performance and functionality? Is there a price to pay for having this setup? Learn more about it in our full review below.
online price (US)**
±399.00 $$$$$/ 7

(annual filter cost ±44)

** MRSP (Manufacturer's Suggested Retail Price)/ RSP (Retail selling price) is accurate at the time of posting.
^ Annual filter cost is calculated based on filter price and 12 hours of usage. Pricing could vary depending on air quality, usage frequency, and speed.
` The indicated online price guides as follows: $ = under $50, $$ = $50-100, $$$ = $101-200, $$$$ = 201-300, $$$$$ = $301-400, $$$$$$ = 401-500, $$$$$$$ = over $500.

Oreck WK15500B Air Refresh Humidifier Specification

ProductOreck WK15500B Air Refresh Humidifier
11 x 29 x 10.5 in
(27.9 x 73.7 x 26.7 cm)
Weight15 lb (6.8 kg)
Coverage (up to)115 sq. ft. (11 m2)
Airflow speed
Dust free (CADR)77 cfm (131 m3/h)
Pollen free (CADR)77 cfm (131 m3/h)
Smoke free (CADR)77 cfm (131 m3/h)
Humidifying(H) speed
- Lifespan
- Replacement cost ($)
HEPA filter
- Lifespan
- Replacement cost ($)
HEPA Media
6 months
Carbon filter
- Lifespan
- Replacement cost ($)
6 months
Ionizer/ Technologies
UV-light/ PCO
Other filter
Oreck Replacement Filter Kit WK15500B
6 months+ 22
All-in-one filter
- Lifespan
- Replacement cost ($)
Optional/ Addon
Humidifying Capacity
Water tank
Noise level
Power usage level50 W
Timer/ Scheduler1-8 hours
SensorsTemperature, dust, humidity sensors
Auto mode
Air qualityAQ indicator
Filter change indicator
More color options
Wi-Fi/ BTBluetooth
Remote control
Child lock
Warranty1 year
Email/ Phone support

Key Features

  • 2-stage filtration with humidifying feature
  • Charcoal Odor-Removing Filter
  • HEPA Media - Capture 99% of the particles as small as 0.3 microns
  • 4 fan speeds + Sleep mode
  • Built-in humidistat, digital display with filter indicator and water tank indicator
  • 1-8 hours timer
  • Silent operation
  • Temperature, dust, humidity sensors

Design And Usability

Oreck WK15500B Air Refresh Humidifier dimension
11 x 29 x 10.5 in
(27.9 x 73.7 x 26.7 cm)
Oreck WK15500B Air Refresh Humidifier weight
15 lb (6.8 kg)

One of North America’s most beloved brands. Oreck WK15500B Air Refresh is one fine looking 2-in-1 HEPA Ultrasonic Humidifier. At 16.2 x 15.7 x 11 in dimension and 14.1 lb weight, this is perhaps the slimmest air purifier humidifier here. The tower profile will fit well on tight space, tables and even top of the cabinet with enough support to the base. The front panel can be quickly removed to replace the filter when needed. Water tank is located at the back with grabbing handle that is nicely concealed in the design. It is rather small given how tall the machine is. Refilling is also slightly troublesome as it requires removing the reservoir to check on the water level. Overall the fitting and build quality is there that you would expect no less from the price you paid.

Oreck WK15500B Air Refresh Control

Let’s dive into the control panel. At the top, you will find the main air outlet grill (air inlet grill is located at the side), an LCD digital screen, 5 main touch-sensitive controls, and a reset button. So let’s begin with the blue LCD screen. The screen will display your current fan speed, timer including a number of hours, current RH%, desired humidity target. The top water tank indicator will flash and turn the LCD screen to red when the water level is low. There are also 2 filter life bars (HEPA and carbon) that will decrease according to usage. To begin the operation, press the On/ Off button to the most right. Next to it is the Speed button that will cycle between Low, Mid, High, and Turbo. Middle timer button can be set between 1-8 hours that will auto shut down the machine once the time is up. Humidity button is self-explanatory. With the help of the built-in humidistat, you can set the right RH level so the humidifier will auto switch on or off the device based on your setting. To the most left, Sleep button will set the fan speed to low and dim the LCD screen. Last but not least, the reset filter will reset the life bars that should be used after you have changed the filter.

Airflow, Coverage, And CADR

Oreck WK15500B Air Refresh Humidifier coverage
Purifying coverage
115 sq. ft. (11 m2)
Oreck WK15500B Air Refresh Humidifier fanspeed

Oreck WK15500B 2-in-1 Air Refresh performance is a mixed bag. On one hand, it has a rather small purifying coverage at only 115 square feet. However, the small range does come with an outstanding filtration that can target even the tiniest particles. Pair with the compressed water tank, Oreck WK15500B will be able to run for a day without refilling. If you are planning to use it during bedtime, just keep it between 1-2 speed and you can sleep soundly throughout the night.

BrandPurifying CoverageFan Speed
Sharp KC-860U341 sq. ft.3
BONECO W300 Air Washer Humidifier540 sq. ft.3
OPOLAR Evaporative EV01540 sq. ft.1
Venta LW25 Airwasher Humidifier485 sq. ft.3
Honeywell HCM 3503
Oreck WK15500B Air Refresh Humidifier dust CADR
77 cfm (131 m3/h)
Oreck WK15500B Air Refresh Humidifier pollen CADR
Pollen CADR
77 cfm (131 m3/h)
Oreck WK15500B Air Refresh Humidifier smoke CADR
Smoke CADR
77 cfm (131 m3/h)
CADR or clean air delivery rate also tally with the small purifying coverage. Dust, pollen, and smoke CADR are at 77 cfm output. Way below our 200 cfm benchmark. Not great for living hall but perfect for bedroom use particularly if you are suffering from allergies like cough, red eyes or runny nose.

Filters And Performance

Let's begin with the superb Oreck WK15500B Air Refresh 2-in-1 HEPA air purifier side. The first-stage HEPA Media will capture up to 99% of the airborne particles as small as 0.3 microns. This includes dust, mold, pollen, dust mites, and pet dander. With most non-particles captured, the Charcoal Odor-Removing Filter can focus on removing cooking smoke and cigarette odors. So what about the humidifying part? Oreck WK15500B ultrasonic technology uses a plate that vibrates thus forces the water to exit as mist. It is an eco-friendly, filterless approach but you should only fill in with demineralized water to reduce the risk of mineral buildup.

Noise And Energy Usage

As for the noise and power, think Oreck WK15500B Air Refresh as you normally would for an air purifier. At the lower 2 speed, barely any noise can be heard from the machine. While at max speed, there is some fan noise that is still bearable other than for night time with Sleep mode. Power rate wise is good across all fan speed. Expect a fairly low consumption rate when compared with a full-blown air purifier or dehumidifier.
Noise TypeDecibels
Breathing10 dB
Rustling leaves20 dB
Whispering/ Quiet library30 dB
Light rainfall40-50 dB
Conversation50-60 dB
Vacuum cleaner/ Hair dryer/ Washing machine65-80 dB
City traffic80-90 dB

Pricing And Maintainence Cost

Oreck WK15500B Air Refresh Humidifier MRSP/ RSP
+- 399.00
Oreck WK15500B Air Refresh Humidifier annual filter replacement cost
Annual Filter Cost
+- 44
^ Replacement filters/ estimated cost
At around 399 RSP before discount, Oreck WK15500B Air Refresh 2-in-1 HEPA Ultrasonic Humidifier price is on the higher side. That said, it is still cheaper than getting an air purifier and a humidifier separately. The price you paid also comes bundled with a HEPA media and carbon filter. Unfortunately, that would also bring us to the downside. Even though the filter replacement cost is inexpensive, both HEPA and carbon filter has a relatively short 6 months lifespan. You may have to fork up more on filter recurring fees than the competitor's model.
There are 2 places you should consider when purchasing an Oreck air purifier. First is of course, Amazon as that it is the only best place to buy Oreck WK15500B Air Refresh with good discount, free shipping, and hassle-free order. Otherwise, try Oreck official website if you prefer it to be ship directly from the manufacturer (not available in every country). Retailers like Costco, Walmart, Best Buy may carry the product but its always subject to in-stock availability.

Oreck WK15500B Air Refresh Humidifier VS The Challengers

Sharp KC-860U Plasmacluster Air Purifier Humidifier Review

Sharp KC-860U Humidifier

The only air purifier dehumidifier that mange to pit against Oreck WK15500B. Sharp KC-860U is the pricier, better "air purifier" version but at the cost of humidifying.
BONECO W300 Humidifier Air Washer Review

BONECO W300 Air Washer Humidifier

If you fancy the freedom of not having to replace the filter, BONECO W300 is your call. If may not share the same level of air purifying, the humidification capacity is there along with a cheaper price tag.


  • Powerful humidifying that will auto on or off when it reaches a humidity point.
  • Bundled with HEPA media and charcoal filter that captures allergens and smoke particles.
  • Advanced setting including 1-8 hours timer, 4 fan speed, and sleep mode.
  • Highly readable digital display will humidistat and filter lifespan indicator.


  • Expensive price tag with a rather mild humidifying feature.
  • Small purifying coverage with limited airflow delivery rate.
  • Only 6 months filter lifespan for both HEPA media and carbon filter.
Oreck WK15500B Air Refresh

Max Fernandez

A loving father and a dedicated reviewer for airfuji.com with more than 1000 air purifiers under his belt. Max Fernandez is also one of the million patients currently suffering from asthma. Feel free to nudge him if you have any questions.
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