Sharp KC850U Air Purifier and Humidifier
- True HEPA filter, 0.3 micrometer particle size, plus activated carbon
- Plasmacluster ion technology with a 3-stage filter
- Built-in humidifier, sensors adjust fan and humidity
- 1,230 sq ft in one hour per title, 254 sq ft room in seller copy
- 36 dB noise level, 50 watts
- 20.5 pounds, 23.11 inches tall, touch controls
- 1 year limited warranty
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A combination purifier and humidifier with ion technology for medium rooms. Its coverage figures differ across the listing, so size it cautiously.
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ASIN: B003BF665YModel: KC850UCategory: HEPA Air Purifiers
Overview
Sharp builds the KC850U as a purifier with a humidifying function, using a three-stage filter and Plasmacluster ion technology. Sensors monitor air quality and adjust the fan while holding a comfortable humidity level.
One unit covers filtering and humidifying, with sensors that adjust the fan on their own. The coverage claim is the weak point: the title and the seller copy give very different room sizes. The pre-filter is washable.
Who it's for
Allergy and asthma households with a bedroom or study that gets dry air will use the combined features. Anyone needing a clear room size rating, or a small desk unit, should look at models with firm numbers.
Pros and cons
- Purifier and humidifier in one unit
- True HEPA filter
- Sensors adjust the fan automatically
- Coverage figures conflict in the listing
- Heavy for a portable unit
- Filter replacement schedule not listed
Performance notes
Air passes through a washable pre-filter, a filter layer and a carbon layer, so large particles are caught first and odors are reduced. Sensors read air quality and set the fan, and the ion technology releases ions that the maker says act on pollutants. Humidifying adds moisture to dry rooms.
Specifications
| Brand | Sharp |
|---|---|
| Model | KC850U |
| Dimensions & fit | |
| Particle Retention Size | 0.3 micrometer |
| Item Dimensions D x W x H | 10.5 x 14.87 x 23.11 inches |
| Item weight | 20.5 pounds |
| Capacity & performance | |
| Noise Level | 36 dBhigher than 64% of 48 hepa air purifiers |
| Wattage | 50 watts |
| Construction & materials | |
| Color | White |
| Warranty & support | |
| Warranty Description | 1 year limited |
| Other details | |
| Floor Area | 1,230 sq ft per hour (title); 254 sq ft room (seller copy)higher than 76% of 22 hepa air purifiers |
| Filter Type | True HEPA, activated carbon, washable pre-filter |
| Control Type | Touch, button |
| Special Features | Plasmacluster ion technology |
| Humidifier | Built-in humidifying function |
Closest rivals on specs
AirDoctor AD2000 Air Purifier- Noise Level 36 vs 30 dB (+20%)
Levoit Core 300-P HEPA Air Purifier- Floor Area 1230 vs 1073 sq ft (+15%)
- Noise Level 36 vs 24 dB (+50%)
PuroAir 240 HEPA Air Purifier- Floor Area 1230 vs 1000 sq ft (+23%)
- Noise Level 36 vs 22 dB (+64%)
Frequently asked questions
How do I care for the Sharp KC850U filters?
The seller copy says the pre-filter is washable and traps dust and larger particles. The listing gives no replacement schedule for the other filters and no humidifier cleaning steps.
How big a room does the Sharp KC850U cover?
The listing is inconsistent: the title says it covers up to 1,230 sq ft in one hour, while the seller copy says it purifies a room up to 254 square feet. Use the smaller figure as a guide.
Is the Sharp KC850U only an air purifier?
No. It also has a humidifying function, and sensors adjust the fan while providing the right humidity level.
Does the Sharp KC850U use a true HEPA filter?
The title says True HEPA and the seller copy describes a three-stage filter system. The filter type entry in the specs lists activated carbon.