Clean Air Guides is an independent US website about indoor air quality. It publishes research-based buying guides to air purifiers, humidifiers and purifier-humidifier combos, practical how-to and troubleshooting guides, and free calculators for air purifier room size, running cost and dew point.https://cleanairguides.com/https://cleanairguides.com/quietest-air-purifier/https://cleanairguides.com/quietest-air-purifier/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.Fri, 23 Oct 2026 00:00:00 GMThttps://cleanairguides.com/air-purifier-and-humidifier-together/https://cleanairguides.com/air-purifier-and-humidifier-together/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.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/best-air-purifier-for-large-room/https://cleanairguides.com/best-air-purifier-for-large-room/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.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/best-evaporative-humidifier/https://cleanairguides.com/best-evaporative-humidifier/Six evaporative humidifiers picked from maker specs and manuals, plus how wick humidifiers work and how they compare with ultrasonic models.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/best-whole-house-humidifier/https://cleanairguides.com/best-whole-house-humidifier/Four furnace-mounted humidifiers from AprilAire and Honeywell Home, compared by gallons per day, sizing, installation and yearly upkeep.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/blueair-311i-max-review/https://cleanairguides.com/blueair-311i-max-review/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.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/condensation-on-windows/https://cleanairguides.com/condensation-on-windows/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.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/coway-airmega-ap-1512hh-review/https://cleanairguides.com/coway-airmega-ap-1512hh-review/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.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/do-air-purifiers-use-a-lot-of-electricity/https://cleanairguides.com/do-air-purifiers-use-a-lot-of-electricity/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.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/does-a-humidifier-help-with-congestion/https://cleanairguides.com/does-a-humidifier-help-with-congestion/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.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/dust-mites-and-humidity/https://cleanairguides.com/dust-mites-and-humidity/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.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/dyson-purifier-humidify-cool-review/https://cleanairguides.com/dyson-purifier-humidify-cool-review/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.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/essential-oils-in-humidifier/https://cleanairguides.com/essential-oils-in-humidifier/Not in the water tank. Most makers say oils damage the plastic, cause leaks and can void the warranty. Use an aroma pad if your model has one, and mind your pets.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/how-long-to-run-air-purifier/https://cleanairguides.com/how-long-to-run-air-purifier/Run it whenever you're in the room, ideally all the time on Auto or low. A well-sized unit clears a closed room in about 30 to 40 minutes on high.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/how-to-check-humidity-in-house/https://cleanairguides.com/how-to-check-humidity-in-house/A hygrometer is the easiest way to check indoor humidity. Here is how to choose one, test its accuracy, place it and read the result.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/how-to-reduce-humidity-in-house/https://cleanairguides.com/how-to-reduce-humidity-in-house/Measure first, then vent moisture outdoors, run the AC or a dehumidifier and cut indoor moisture sources until humidity stays between 30% and 50%.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/humidifier-white-dust/https://cleanairguides.com/humidifier-white-dust/White dust is tap-water minerals thrown into the air by ultrasonic and impeller humidifiers. Here is what the EPA and CPSC say and how to stop it.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/ionic-air-purifier/https://cleanairguides.com/ionic-air-purifier/How ionizers and electrostatic purifiers work, what EPA and CARB say about ozone, which popular HEPA models let you switch the ionizer off, and what we'd skip.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/iqair-healthpro-plus-review/https://cleanairguides.com/iqair-healthpro-plus-review/A research-based look at the IQAir HealthPro Plus XE: what its 300 cfm and 1,125 sq ft claims mean without an AHAM CADR, its filters, power use and AHAM-rated rivals.Wed, 21 Oct 2026 00:00:00 GMThttps://cleanairguides.com/levoit-core-600s-review/https://cleanairguides.com/levoit-core-600s-review/A research-based look at the Levoit Core 600S (now the Core 600S-P): AHAM CADR, room size, rated vs measured watts, filters, app and CARB listing, plus how it compares.Wed, 21 Oct 2026 00:00:00 GMT