Blueair - Sense+

Just never buy from blue air directly. They won’t help up if a package is lost. I’ve used a few other smart purifiers. The Dyson ones suck at dust and the smart part works with Alexa and google home only and it’s very buggy. It needs to be reconnected often. Just got a lg 360 and it’s good other than the wifi module in the unit. It loses connection frequently and also is limited to their app. It briefly worked in Alexa and google home but often non responsive. It does have built in air quality sensor though. We also had a blue air sense model several years ago. That was one of their first smart models. It had to get WiFi reset about once a year and didn’t support a lot of integrations. Eventually the WiFi module failed on it. We have business grade wifi (Cisco Meraki mr56 x 2 APs). so it’s not like budget consumer WiFi routers.

I have tried and gotten rid of Bluair and levoit- just inadequate performance and louder than I like. I replaced them with Medify and have been very happy with the switch. If memory serves I have an ma-50 in the living room and ma-40 is each bedroom. 

We run 3 in our house, one in the main living area (diy pc fan with hvac filters), and one in each bedroom (blue air brand or something, I think). Also consider plastic on leaky windows (cheap sliders).

The replacement filters cost too much and hold only 4ish months

I bought the shark never change as my first purifier just recently and I feel the difference with my allergies. The 5 year filter change really attracted me but after reading here a little more I might need to change it more frequently. I also tried the blue air for my office but didn't like it, I didn't feel any difference and it was noisy, I returned it and got the smaller shark never change .

I also really like Blue Air and mine are all 6+ years old at this point.

I have a few Levoit the same size as this one. I don’t really care for them compared to the Winix and Blue Air ones I have.

Love mine too. We got 3 and they’re holding up better than the Blue Air’s I got.

I have terrible allergies and use Blue Air on every level. Works amazing.

You say costs don't matter, but what does that mean? There are devices for thousands of dollars out there, and you'd need multiple in a home. My general suggestion is to find a balance between *total cost* (initial, plus ongoing filters, plus electricity) so you can maximize the benefit and not feel pinched. Wirecutter previously did some studies on total costs - you can try to find them online, but it's been some years. If you really have no cost, just get the largest air purifier you can fit for each room and run it at the highest speed. Your home may feel like a wind tunnel, and that means it's working. For most people, Blue Air is a good balance in these various aspects. They are affordable up front, filters from the OEM aren't too bad (and generics are available on Amazon), and they have an outer washable filter (so you don't waste the expensive inner one on say, pet hair, etc.). If it were me, I'd get a large one for the room I sleep in, and at least one or two others. Ignore any automatic sensor based setting they offer. At night, or when you're in the room, you want it on the highest setting possible, and during the day, turn it down just one notch. You want the air flow to circulate and air to essentially be "scrubbed" by the filters. Remember this is only a secondary or tertiary method of cleaning in terms of priorities. Your best bang for your buck is washing your bedding weekly (including the comforter) in unscented detergent, vacuuming or sweeping, and having good airflow in your home to prevent dust and mold build up (leave bathroom and closet doors open). Use your A/C generously to keep humidity levels down in the humid months and for the sake of your sinuses, use a humidifier in the dry cold winter months if your climate has them.