VIVOSUN Quiet Register Booster Fan, Smart Register Vent with Thermostat Control, Fits 4”×10” Register Holes, Heating Cooling AC Vent Fan, Black

These work 100% and are awesome! Our bedroom is above the garage, its always either too hot or too cold. Its summer now and we easily installed two vents in our room and definitely notice a significant difference. Our room is pretty big and has a vaulted ceiling so it has a lot of air volume, I was surprised at how quickly things cooled down The other day was 73° so we had the windows open and turned these off. The next day was a steamer and we forgot to turn them back on and it was nasty warm in our room. Turned these puppies on and within a few hours our room was noticeably cooler. Can't wait to see how it works when the heat is on!

This register works amazing Keeps the room nice and warm compared to before

The device is of good quality and works as expected according to the user manual (strongly suggest everyone to get familiar before using). The primary purpose was to improve air flow into a room during both heating and cooling seasons. Unfortunately, I cannot detect any perceptible or statistical effect of using the device: the room temperature was continuously recorded from a digital thermometer but it did not show any difference compared to not using the device.

Worked great for less than a week. Then it broke. I’m pretty handy, there is no way for me to fix this. I ordered a replacement. Hoping this was just a lemon. It’s not “quiet” you can absolutely hear it, I did have it on the highest setting though but you will hear it.

Bought this to boost airflow in bedroom. It’s farthest room from air handler. It works good. It comes on and off based on temperatures you set. Kinda wish it would just come on when air flow is sensed.