Screw Dyson. Get a Winix HR1000. You can find them cheap ($200 or so) on eBay every so often. I picked up two a couple years ago and am very happy with them. You only need to replace the filters once a year. They've made a HUGE difference with my allergies. They automatically adjust airflow based on built-in air quality sensors. They are completely silent, aside from the "turbo" mode (~300CFM lol), but if you like white noise, it's great.

We recently got a Winix U300 (1) for about £150 new. It is basically a HEPA + Activated Charcoal filter and it claims it has some "plasmawave" thing that generates "free radicals" that kills odors and viruses. Initial searching suggests that this might be true, but I am unsure if there is any way to really test it. The air quality sensor certainloy works if you drink a strong coffee then go and blow into the sensor - the fans crank up the speed hugely to compensate for the stinking coffee breath! :)

Only criticism is that the U300 does not have wifi connection - only IR control... I am hacking up a esp8266 + some IR LEDs and photoresistors to monitor and control it via MQTT though which is fun. The "wifi connected" units seem to add several hundred GBP to the price for the same filtering performance.

We're not sure if we're noticing any actual improvements in air quality, or just imagining it...! :-) The placebo effect is quite good if nothing else. Noses feel less congested, and the air in the room feels less stuffy in the morning.

1 - https://winixeurope.eu/air_purifiers/winix-u300/ No personal connection to these guys, just a satisfied customer (so far after a few months)

Sounds like a fun project with the ESP! I personally don't care for the WiFi stuff, although the app's air quality graph is pretty neat.

I have no way to really measure its effectiveness, but it very quickly removes any cooking smells and has fixed my year-round allergies while indoors.

I bought one because of the fire near Chico, and I've been liking it. It's quiet enough to have in my bedroom, and the space heater aspect of it works well. It's cheaper than running the giant non-zoned furnace that heats our whole house.

> cooler during the summer

Where does the heat go?

It's just a fan + heater. It's not an air conditioner, nor is it marketed as such.

I have one. It works pretty well. The air filter isn't as good as the massive Austin Air I use for my living room, but it's okay for a smaller room... not to mention much quieter, smaller, and easier to integrate with home automation.

Just like any fan, it makes you feel cooler. It doesn’t actually cool the air.