Reviews
Air purifiers and humidifiers compared on published, certified ratings: what each unit is rated for, what it is not, and which one a given room needs.
Units compared on what their makers publish and what the rating programmes certify, never on bench tests this site did not run. Where a rating is not published, the page says so.
Space heaters 5 pages
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Best garage heater: 240 V, 120 V and gas by spec
Maker sheets compared: Dura Heat EUH4000 240 V 20 A NEMA 6-20P 500 sq ft; King KBP2406 5,700 W 23.8 A UL 2021; EUH1500 120 V 12.5 A; vented Big Maxx 50,000 BTU.
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Best baseboard heater: Cadet, King, Fahrenheat
Maker sheets compared: Cadet 6F1500 72 in 1,500 W 6.3 A 5,120 BTU UL; 3F750W 750 W 3.1 A; King 3K2407 cULus; plug-in Fahrenheat FBE15002 120 V 12.5 A.
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Best oil-filled radiator heater: 5 picks by spec
Maker pages compared: Dreo 153 600/900/1500 W, 7 fins, 41-95 F, 17.9 lb; Dreo 310 alone prints ETL listed; De'Longhi EW7707CM 23.37 lb, no tip-over switch.
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Best electric fireplace heater: picks by spec sheet
Maker manuals compared: Touchstone Sideline 28, 12 A plug-in only; PuraFlame Western 750/1500 W, 4600 BTU; Dimplex IgniteXL 2,500 W, 8,530 BTU on 240 V, UL file.
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Best space heater: 1500 W picks compared by spec
Maker sheets compared: Dreo Atom One 1000-1500 W, 41-95 F thermostat, 37.5 dB; Vornado MVH tip-over switch, ETL Listed, 5-year warranty; Lasko 751320 prints none.
Humidifiers 4 pages
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Best hygrometer for indoor humidity, by maker spec
Maker specs compared: TempPro TP50 +/-2% at 30 to 80% RH on one AAA; Govee H5075 +/-3% RH, 20 days of records, CSV; AcuRite 01083M +/-2% from 10 to 90% RH.
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Best large room humidifier, by maker spec sheet
Maker sheets compared: AIRCARE MA1201 3,600 sq ft and 3.6 gal, Levoit Superior 6000S 1,500 mL/h, Vornado EVDC500 3.5 gal per 24 h. No AHAM rating printed anywhere.
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Best whole-house humidifier, by maker spec sheet
Maker sheets compared: Aprilaire 600 17 GPD bypass, 5-year warranty; Honeywell HE280 17 GPD, 1 year; Aprilaire 800 steam 11.5 to 34.6 GPD by voltage and amps.
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Best bedroom humidifier, by maker spec sheet
Maker sheets compared: Vornado EV100 1 gal per 24 h, 40 to 60% humidistat, wick 4 to 8 weeks; Levoit LV600HH 300 mL/h, 280 W, Auto Mode 55 to 68% RH, past EPA's 50%.
Air purifiers 4 pages
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Best air purifier for wildfire smoke by smoke CADR
For wildfire smoke AHAM asks for a smoke CADR equal to the room's sq ft: Levoit Core 600S-P 391, Blueair 311i Max 283, Winix 5510 253. ENERGY STAR and CARB listed.
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Best air purifier for pet hair and odor by spec
Levoit Vital 200S-P: AHAM smoke CADR 250, washable pre-filter for hair, 6 to 12 month filter. Core P350 Pet Care 140 but brush-only pre-filter; Blueair 211i Max 435.
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Best air purifier for a large room by AHAM CADR
AHAM smoke CADR x 1.55 sizes a large-room purifier: Levoit Core 600S-P 391 for 606 sq ft, Blueair 211i Max 435 for 674 sq ft, ENERGY STAR and CARB listed.
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Best air purifier for bedroom and living room by CADR
AHAM, ENERGY STAR and CARB listings compared: Levoit Core 300 smoke CADR 143 for a 222 sq ft bedroom, Blueair 211i Max 435 for 674 sq ft, CARB types listed.
Smoke and CO alarms 2 pages
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Best smoke detector, by maker spec and NFPA rule
Kidde 20SD10 for battery-only homes, 20SA10 for hardwired, both listed to UL 217:2024 Ed.10; First Alert dual sensor runner-up; NFPA placement and the 10-year rule.
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Best carbon monoxide detector, by maker spec sheet
Maker sheets compared: Kidde KN-COPP-3 plug-in, 30-999 ppm display, 10-year life; Kidde COB10 sealed 10-year battery; First Alert CO605, 7 years; same UL 2034 bands.
Radon 2 pages
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Best radon mitigation fan: fan curves compared
Maker fan curves compared: RadonAway RP145 34-66 W, 81 CFM at 1.0 in. WC; GP501c 3.8 in. WC for clay; Festa Maverick 116 CFM. EPA says use a qualified mitigator.
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Best radon detector: monitors compared by spec
Maker specs compared: Airthings Corentium Home 2 shows 24h to long-term averages on 2 AA for 3 years; RadonEye RD200 reads in 10 minutes. EPA fixes at 4 pCi/L.
Air quality monitors 1 pages
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Best air quality monitor for PM2.5 and CO2, by spec
Maker specs compared: Aranet4 NDIR CO2 0-9999 ppm, 4-year battery; Airthings View Plus adds laser PM2.5 0-1000 ug/m3 and radon 0-500 pCi/L; Temtop exports CSV.
Dehumidifiers 1 pages
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Best bathroom exhaust fan, by maker spec sheet
HVI sizes a bathroom at 1 CFM per sq ft up to 100 sq ft. Panasonic FV-0511VF1 prints 110 CFM, 0.8 sones and 10.2 W at 0.1 in. w.g.; Broan BEL8 80 CFM, 1.5 sones.
Furnace filters 1 pages
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Filtrete 1500 vs 1900 vs MERV 11-13: 1-inch filters
Filtrete 1500 (MERV 12) and 1900 (MERV 13) vs Honeywell MERV 11 and 13 in 16x25x1 and 20x25x1: 3M's MPR chart, no Honeywell FPR equivalence, in-stock packs.
Thermostats and heat pumps 1 pages
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Best smart thermostat: C-wire, ENERGY STAR compared
ENERGY STAR prints 8% savings, about $50 a year. ecobee Premium ships its Power Extender Kit and a sensor; Nest 4th gen prints 3 heat stages; Sensi needs a C wire.