This is a mixed bag. The unit itself IS good at increasing airflow and cooling down an upstairs room in the summer, so that is great. Combined with closing some downstairs vents, I saw big gains in temperature consistency on the different floors of my house.
However, this was with running it on high speed all day. And that comes with some major downsides. For one thing, it's very noisy: like a desktop PC while playing some graphics-intensive game. I personally sleep with a white noise machine in the bedroom, so for me this was just added white noise that I couldn't even hear at night, and no one is in the bedroom to mind about this during the daytime.
The unit does have a smart mode that ostensibly activates the unit only when the AC (or heat, based on the current configuration) is running. The mechanism for this is fairly clever: it checks the surrounding air temp, and activates when the temperature is below a certain threshold, assuming that to be an indication that the system is running.
This sounds nice on paper, but has some flaws in design. For one thing, it is very confusing how to set this up and took me quite a while to understand. Once you figure it out, it's easy to do. But the instructions are a little baffling, partly because of some fairly poor translation (presumably from Chinese).
Once set up correctly, I still wasn't able to get good results from this smart mode. The unit temperature was not sufficiently precise or reactive to notice when my AC had switched on.
A better design for this unit would instead accommodate an anemometer and monitor ambient air speed. This would require some clever programming to switch off its own fans during measurement, but it would ensure that the fan was always running, even if the HVAC system was running in "fan only" mode — which this unit currently has no way to detect. That's a shame, because "fan only" would be a great way to passively circulate air at a lower cost.
The poor temp control would be manageable, IF it were possible to control this unit with a smart switch. In that case I could manually wire up a system that would switch on this device when the AC was on, and switch it off otherwise. But unfortunately, if this device loses power, and then power is restored, it "forgets" what mode it was in, and remains off until you press a button on the unit or on the remote.
For me, that makes this device much less valuable, and I ended up returning it in favor of one that I could control more easily. That said, this is not a bad unit, and if you don't mind these limitations it could work well for you.
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