GermGuardian AC4825E
#6 in Small roomsFull review
A cheap, slim tower purifier for a small bedroom or office.
Amazon $80.74$80.74
3.1/5
A pet-oriented purifier for bedrooms up to about 185 sq ft. Its hair-catching pre-filter is the draw, but plain purifiers deliver more clean air per dollar.
- 119 cfmSmoke CADR
- 184 sq ftRoom size
- $119.96/yearFilters
- 2 yearsWarranty
Check price at Amazon$89.99
Price checked October 22, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Pet design: a bottom intake and a reusable pre-filter catch hair before it reaches the main filter
- Auto mode adjusts the fan to the air-quality sensor
- Two-year warranty
Cons
- Expensive for its size: $90 for a small-room AHAM rating
- Filters cost $30, and KNKA says to replace them every 3 to 6 months
- KNKA publishes no noise figures
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its room size. How we rank explains each one.
Specifications
| Model number | APH2500P |
|---|---|
| Performance | |
| Smoke CADR | 119 cfm |
| Dust CADR | 123 cfm |
| Pollen CADR | 147 cfm |
| PM2.5 CADR | 121 cfm |
| CADR certified by | AHAM Verifide |
| Room size (AHAM) | 184 sq ft |
| Efficiency | |
| Efficiency (IEF) | 5.2 cfm/W |
| ENERGY STAR | No |
| Energy use | 137 kWh/year |
| Filters | |
| Filter | HEPA-type |
| Activated carbon | Yes |
| Replacement | APH2500P filter |
| Replacement cost | $29.99 every 3 months |
| Yearly filter cost | $119.96/year |
| CARB certified (ozone) | Yes |
| Controls and build | |
| Air-quality sensor | air quality (type not stated) |
| Auto mode | Yes |
| Wi-Fi app | No |
| Warranty | 2 years |
| Released | 2026-09 |
Alternatives in this room size
Levoit Core 200S
#7 in Small roomsFull review
A cheap smart purifier for a small bedroom or office. Choose something bigger for a living room.
Amazon $69.98$69.98
Levoit Core 300
#9 in Small roomsFull review
A simple, proven purifier for a bedroom or small living room. Buy the Core 300S only if you want auto mode and app control.
Amazon $89.99$89.99
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