These are noisier than I expected, but appear to work well.
These are simple and easy to use: just plug them in. They're noisier than I expected, but appear to work nonstop and well. In time, this becomes background "white noise". I wanted the Germ Guardians for the UV-C light, to destroy viruses. This should decrease the viral load in the air. It's quicker, easier, and cheaper to plug them in than to add a UV-C light into an AC/Heater unit. The price varies, so you may wish to watch for a sale.
Rating: 5 stars