Honeywell HPA300 vs Winix 5510 Compared: Honeywell dims its lights and keeps its speed, Winix’s dark Sleep reduces airflow

Check these before you buy

• Make sure you are buying the black US Honeywell HPA300 or the US 120V Winix 5510, and note which filters come with it. The Honeywell HPA5300B and the Winix 5500-2 are different models. The Winix manual is shared with the 5520, though the unit in question here is the 5510. Review the current seller, condition, filter package and return terms. Do not assume an extra filter bundle or a remote handset.
• On Honeywell Store, the HPA300 listing is marked discontinued. That describes the retailer’s own listing and tells you nothing about manufacturer-wide production or another seller’s stock. No claim is made here about current price, availability or delivery. A cheaper-looking offer is no reason to skip the exact-model and filter-package checks.
• For smoke particles, the comparison is Honeywell’s 300 against Winix’s 253 CFM. The separate dust ratings are 320 and 252 CFM, and the pollen ratings are 300 and 247 CFM. Do not sum the pollutants or swap a dust figure in for smoke. AHAM CADR is measured at the highest fan speed. No number here is a gas-removal rate or a raw fan-airflow measurement.
• Picture a room 18 feet long, 20 feet wide and 9 feet high. Its volume is 3,240 cubic feet. Aiming for five filtered-air changes per hour means 3,240 times 5 divided by 60, or 270 CFM. Honeywell’s maximum smoke rating passes this sizing check and Winix’s does not. The five-change target was chosen for the example and is not a medical threshold. The calculation sizes filtered air and does not describe fresh-air ventilation.
• Take a 15 by 15 by 8-foot room. It holds 1,800 cubic feet, and the same chosen target calls for 150 CFM. Both maximum smoke ratings pass, but that does not prove either unit reaches 150 CFM on Low, Auto or Sleep. Particle levels can also change with room mixing, layout, open doors or windows, ongoing sources and filter condition. Neither example sizes an entire connected home.
• Low is where the HPA300 starts. Once it is on, tap Turbo to reach the highest speed, and tap Turbo again to go back to the previous setting. A separate dimmer cycles through High, Low and Off while the fan keeps running. For continuous operation, leave the 2, 4 or 8-hour shutoff timer unset. None of this amounts to a later-start schedule or a sensor-driven fan routine.
• On the Winix, the odorous-gas sensor drives Auto, which picks Low, Medium or High. Turbo has to be chosen manually. A light sensor can put the unit into Sleep when the room darkens, and the product page says it goes back to Auto as the light increases. Sleep runs at a speed below Low and turns the air-quality LED off. No maximum-speed CADR is established for Auto or Sleep. The gas-sensor status neither measures PM2.5 nor certifies the air in the whole room as safe.
• Winix Smart phone control requires compatible Wi-Fi and app pairing. The Wi-Fi button on the unit turns connectivity on or off, and holding it for three seconds begins pairing. According to the manual, a PlasmaWave button enables or disables that feature. Sleep turns PlasmaWave off at first, though you can switch it back on. This page establishes no separate PlasmaWave-off CADR, no automatic return to your preferred setting after every restart and no app scheduling sequence.
• Stand the Honeywell upright on a firm, level, dry indoor surface. Its front should face away from the nearest wall or furniture, with no grille blocked, and you need clear access to the front for filters. Bathrooms, laundry areas and other damp locations are out, and so are places with combustible gases and vapors. Plug directly into a working wall outlet and skip extension cords and power strips. Turn it off and unplug it before you remove the wrappers from all filters. Then fit the three Type R HEPA elements with the pull tabs facing outward and the Type A prefilter at the front.
• The Winix needs a hard, flat indoor surface out of direct sunlight, with 12 to 18 inches between it and the walls for maximum airflow, plus clear access to the front for service. Never block the vents, lay it on its side or put it under an electrical outlet. Heat, steam, oily residue, flammable gases and spark-producing items should all stay away from it. Run it on the correct 120V supply and keep other appliances off the same outlet or power supply. Take the wrappers off the filters before use and load them with HEPA at the back, AOC carbon in the middle and the prefilter at the front.
• Honeywell maintenance starts with turning the unit off and unplugging it before you open the front. No filter in it is washable. Check them from time to time. Replace the Type A prefilter about every three months and all three Type R HEPA elements about every twelve months, depending on use and condition. Do not breathe in collected dust, and reset the relevant reminder once you have replaced a filter. The reminders follow usage and are not a measured guarantee of how much filter capacity remains.
• Before cleaning the Winix, unplug it and give it time to cool. The reusable prefilter needs cleaning every 14 days with a vacuum or soft brush. Rinse it only if it is excessively soiled, with room-temperature water and no soap or detergent, and let it dry for at least 24 hours before it goes back in. The carbon and HEPA filters must not be washed. The manual puts their replacement at about twelve months, depending on the environment, and specifies Filter Q, 1712-0123-00. After swapping them, put the prefilter back, close the front and, with the unit on, hold Filter Reset for at least five seconds.