Guides, reviews and how-tos
Every Clean Air Guides article in one place: air purifier and humidifier buying guides, combos, how-to and troubleshooting guides, and indoor air quality explainers.
Air Purifiers
Five air purifiers with the lowest published noise figures, what their decibel ratings do and don't tell you, and how to stay quiet without losing clean air.
11 min read
Combos
Yes, you can run both in one room. Keep humidity at 50% or below, give each machine its own space, and keep the humidifier clean.
7 min read
Air Purifiers
Six air purifiers with enough verified clean air for living rooms and open plans of 500 sq ft or more, plus how to size one and when two units beat one.
11 min read
Humidifiers
Six evaporative humidifiers picked from maker specs and manuals, plus how wick humidifiers work and how they compare with ultrasonic models.
11 min read
Humidifiers
Four furnace-mounted humidifiers from AprilAire and Honeywell Home, compared by gallons per day, sizing, installation and yearly upkeep.
10 min read
Air Purifiers
A research-based look at the Blueair Blue Pure 311i Max: CADR from Blueair and ENERGY STAR, room size, 32 W power, HEPASilent and ozone data, filters, app and alternatives.
9 min read
Guides
Water on the inside of your windows means the glass is colder than the room air's dew point. When it's normal, when humidity is too high and how to fix it.
7 min read
Air Purifiers
A research-based look at the Coway AP-1512HH Mighty: Coway's CADR and room size, filters, ionizer switch, noise and power, stock status and how the new Mighty2 compares.
9 min read
Guides
Not much. Most current purifiers draw under 80 W even on top speed, so running one 24/7 costs roughly $10 to $125 a year at the US average rate.
7 min read
Humidifiers
MedlinePlus, CDC and Mayo Clinic list a clean, cool-mist humidifier as comfort care for a stuffy nose. Here's what it can and can't do, and how to use one safely.
6 min read
Guides
Dust mites live on moisture from the air. Keeping indoor humidity below 50% is the best-supported way to cut their numbers; here's how to get there.
6 min read
Combos
A research-based look at the Dyson PH2 De-NOx: filters, 1-gallon tank, UV-C, Deep clean, the numbers Dyson doesn't publish, and how it compares.
9 min read