I have had a lot of humidifiers. Like dozens. I use them on my reptile environments. They run more that 12 hrs a day, and generally don’t last a long time. I do have one survivor that is a Air-o Swiss or SwissAir. The brand I buy now is Levoit, though.

As for your questions:

1. Not much difference

2. The rates vary wildly. I set mine at a low rate and leave it.

3. Built-in sensors are weak. Don’t trust ’em.

4. Cleaning. All of ’em. I now use a brief bleach soak (for the plastic tank only) about every two days. Some parts would corrode if they were frequently exposed to bleach and they get soap and water. I also use q-tips for the tiny nooks and corners.

It does not seem like any of the companies honor their guarantees. I don’t even bother anymore. Use your American Express card.

Thank you very much!

Two more question:

Does a humidifier with a 1.5-meter mist height have a advantage over regular devices?

How important is it to have a filter to reduce white dust, and does it actually work effectively?

“Does a humidifier with a 1.5-meter mist height have a advantage over regular devices?”

Don’t know. I pipe the output to my habitats.

“How important is it to have a filter to reduce white dust, and does it actually work effectively?”

Don’t know. I use RO water (like distilled) so there is no ”white dust”. You should too for the life of the humidifier. At least use a pitcher-type filter to remove minerals and junk.