GermGuardian AC4825E
The lowest entry price in this lineup, and the pick for buyers who mainly want a HEPA filter running quietly on low overnight. Its 22-inch tower adds an optional UV-C sanitizer stage that the other purifiers here don't offer, though it lacks a dedicated ultra-quiet sleep setting.
We may earn a commission when you buy through our links.
Our Verdict
The lowest price here and a genuine HEPA filter with an optional UV-C stage, but the lack of a dedicated sleep mode means light sleepers will notice more fan noise than with the Levoit or Winix picks.
Score Breakdown
Pros & Cons
Pros
- •Lowest price of the five, often under $85 with on-page coupons
- •Optional UV-C stage for an extra layer of germ reduction
- •True HEPA filter captures 99.97% of particles down to 0.3 microns
- •Low-speed setting is quiet enough for most sleepers
Cons
- •No dedicated night/sleep mode — low speed still measures louder than the Levoit units' sleep mode
- •Taller, narrower tower shape is less discreet on a nightstand
- •UV-C bulb is a separate wear part to budget for over time
Specifications
| CADR (Smoke) | 125 CFM |
| Room Coverage | ~743 sq ft (manufacturer, not AHAM-certified) |
| Filter Type | 3-in-1: carbon pre-filter, True HEPA, UV-C (optional) |
| Noise Level (Sleep Mode) | 32 dB (low speed, no dedicated sleep mode) |
| Smart Features | None (3-speed dial, UV-C toggle) |
| Filter Replacement Cost | ~$25 every 6-8 months |
| Dimensions | 9" x 6.5" x 22" |
Who Is This For?
Best For
- Budget-focused buyers who mainly need a functioning HEPA filter overnight
- Anyone who wants the option of a UV-C sanitizing stage
- Small bedrooms where upfront cost matters more than smart features
Not For
- Light sleepers who need the absolute lowest noise floor
- Buyers who want a compact, low-profile unit for a small nightstand
Where to Buy
Appears In
Customer Reviews
Alternatives to Consider
Levoit Core 300
Levoit
The default recommendation for a nightstand-sized bedroom purifier. The Core 300 pairs a genuine H13 HEPA filter with a dedicated Sleep Mode that drops fan noise to 24 dB and dims the display — quiet enough to run all night next to the bed without being a distraction.
Levoit Vital 100S
Levoit
The Core 300's smarter sibling. For roughly $15 more, the Vital 100S adds a real-time PM2.5 readout on the display, VeSync app scheduling, and a washable pre-filter that cuts down on replacement-filter waste — while keeping the same 25 dB sleep-mode noise floor.
Levoit Core 300S
Levoit
The same quiet Core 300 hardware wrapped in full smart-home control. The 300S adds WiFi, Alexa and Google Assistant voice commands, and app-based scheduling, so the purifier can ramp down automatically at bedtime and back up in the morning without touching a button.
Winix A230
Winix
A true HEPA alternative to the Levoit lineup with a built-in air quality sensor and Auto Mode that reacts to what it detects overnight. Its PlasmaWave odor feature can be switched off entirely, which matters for anyone sensitive to ionizer-style purifiers in a closed bedroom.