Blueair - Classic 680i

If you can get out of the blueair system. They will not give any help once it’s out of warranty (from my experience). The motors are known to go bad and they won’t supply replacement parts and just want you to buy a new one. Mine (680i classic) was $900 and it’s around 4 years old and they won’t help me replace the motor.

In practice they all work fine, usually getting more units is better than getting a higher end one. In my opinion: The best air filters are installed into a new air system such as Daikin, that allows net positive pressure to be inside as it pulls filtered air outside, preventing a leaky home from pollutants entering. But given it needs to pull outside air to get positive pressure inside, it can bring other pollutants unless you get the more expensive charcoal based filters. Most folks don’t have this unless they remodel their homes or it came with it. The second best I prefer is the largest blue air with their charcoal based smoke stop filter that can help clean up VOCs. They have good airflow with low sound, and their filters are quite effective at removing pollutants.

Blueair. Super quiet, super effective and moderately costly. They have good special running right now! Consumer reports has them as the highest rated.

Winix aren’t bad, blueair is one of the best performing. In my opinion, it’s worth the cost. I’d rather have a product that works AND fast, versus a mid product that was on the cheaper side.

I love Dyson too but the cost is wild and their filter’s are also costly. Blueair is a sweet spot, in my opinion. Not too much up front and filters aren’t terrible.

Blueair’s Mac series are quite nice. Their blue line is good as well, just a little bit louder. They will perform well, overall. Consumer Reports shows the numbers, they speak for themselves. The 211i Max is $250, here in the US. Hitachi was even on their lists and only the Dyson Big+Quiet was ranked, right in the same range as the Blueair at twice the price. You won’t regret a blue air. I have 3, classic, blue and max series.

I have a giant blue air and I love it. Before we didn't have one in a smaller space and I feel some days I was dying. The cost of the filters is kind of pricy though.

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).

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.

BluAir (Swedish) is what we used in the middle east.