Excerpt: We’ve been testing the SHARP KC850U for weeks, and it’s quickly become a staple during allergy season. Even in a medium-sized room, the Plasmacluster Ion technology keeps our air surprisingly fresh, neutralizing pet dander and smoke without a hint of overload. The True HEPA filters, which we love for lasting up to five years, are impressively quiet—perfect for late nights. We’ve run the purifier nearly continuously for a month, and the filter hasn’t shown any signs of strain yet. The integrated humidifier was a pleasant surprise, too, especially in dry winter months. While we haven’t hit the full five-year mark yet, the durability seems promising. The only drawback? The sleek design hides its power—its quiet hum fades into the background, almost like a silent guardian. Overall, we’re thrilled with this purifier—it’s a true all-season contender.