A medium purifier covers a large bedroom or a living room up to about 390 square feet. This is the most popular size and where the best values sit: enough clean air for most rooms at a moderate price, with filters that typically cost $30 to $80 a year.
Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Full ranking 7
- Blueair Blue Pure 511i Max#1 of 7Full review
A compact, quiet smart purifier for bedrooms, nurseries and home offices.
Amazon $112.99$112.99153237 sq ft$59.98/year48 - Levoit Core 400S#2 of 7Full review
A strong all-round pick for a living room or large bedroom, with a real particle sensor and app control at a mid-range price.
Amazon $189.97$189.97231358 sq ft$49.99/year52 - Coway Airmega Mighty AP-1512HH#3 of 7Full review
A long-running favourite for a bedroom or living room that’s still cheap on Amazon. It has an air quality sensor but no app.
Amazon $154.98$154.98233-$59.79/year53 - Coway Airmega 150#4 of 7Full review
A quiet, good-looking purifier for a small bedroom or nursery. Bigger rooms need more airflow for the money.
Amazon $186.29$186.29153-$49.99/year48.3 - KNKA APH4000#5 of 7Full review
A low-priced purifier for medium rooms up to about 350 sq ft. It has a sensor-driven auto mode, but filter costs add up if you follow KNKA’s replacement schedule.
Amazon $99.99$99.99226350 sq ft$143.96/year- - Sharp FP-K50UW Plasmacluster#6 of 7Full review
A medium-room HEPA and carbon purifier with long-life filters, for buyers who prefer simple manual controls.
Amazon $179.99$179.99167259 sq ft$34.99/year- - Medify MA-40#7 of 7Full review
A mid-to-large-room HEPA purifier with cheap filters, for living rooms where noise isn’t a concern.
Amazon $249.99$249.99239370 sq ft$80.34/year66
