BIOWIND Silent fan for registration, intelligent ventilation for 4 x 10 inch registration holes with remote control and thermostat control, vent fan

I was truly amazed how well this register worked. It did an excellent job helping to heat a very cold mud room in the winter. Recently I moved it to our bedroom during a heat spell with high humidity. The circulation in our forced air furnace which our heat pump is connected to isn’t great. Our bedroom was very warm. This register help to cool off the room very quickly. It was like a different room after the register ran for a short period of time. The manual was simple and clear and the message was if you have any issues at all contact us immediately! I would buy again.

I was a bit skeptical of this item at first, had a different product years ago that didn't seem to help. But the second story in our home tends to run 3-5 degrees warmer in the summer than the main floor where the thermostat is located and took the chance that this may help. Installation was quite easy, just make sure you get the right size, loved that they had a variety of size choices unlike many other competitors. I admit, it took me a few minutes to understand how to lock in the settings correctly, but got them eventually. The highest fan speed is a bit noisy, but we are a fan family and it's more just like background white noise. And we'll take the noise because the velocity with which it pulls the air is quite strong, you can feel it from several feet away! We are very happy with the unit, when the AC is running, it cools the room to the exact same temperature as the thermostat is set, even a degree lower sometimes! That being said, you have to understand how it works. You program the cooling temperature lower than the thermostat setting by a few degrees, but not colder than the temperature of the air when the AC is blowing. The fan should be off until the AC starts blowing, and once it senses colder air, the fan turns on. This means that when the AC is actively blowing, it makes a significant difference in the room temperature. However, if there are longer periods when the AC is not blowing, the room temperature will creep back up because the unit is off (as it should be since it would then be pulling in hotter air just sitting in the vents). Just a word of caution so you have realistic expectations. My only minor complaint is that it does seem to take a couple minutes to turn on after the AC starts blowing, and stays on for a couple minutes after the AC clicks off. But it's a minor issue and does not seem to detract from overall performance.

No more expensive portable room air conditioners that last less than 5 years!! These work to cool living areas: kitchen in the mornings, bedroom at night. Can't say they are 'quiet' when fan is set to high (8-10), but it's not invasive, more like airplane engine noise at cruise altitude (white noise actually puts most people to sleep, the reason so many people take a flying nap). Settings are simple to make and so far, no problem with digital panel working as expected. Important Note: these plug into electrical outlet, so carefully consider whether they can plug in near your target register vents. Elec cord is reasonably long. I've only used these for one month (summer) with central ac cooling, so can't speak to longevity, but with my bdrm door closed for an hour before bedtime, they bring temperature down abt 10 degrees (with ac running, then I turn central hvac off at bedtime, bdrm stays cool all night). Colder rooms help with getting to sleep. One more thing. These vent units measure the air temp blowing from the vent, not the room temperature. You select the vent temp -- for summer mine is set to come on when vented air is below 70; next winter over 80. Note: an issue arises when trying to set both at same time (not a flaw, issue is covered in instructions), simple to set it once per season.

I have grown to love these... if you want a little boost, you can get them down to quite quiet, if you need to pull more air it can do that too, and still quite manageable. I like how it turns on and off when the a/c or heat is on! The casing is attractive, and the display turns off when you're not using it (so no extra light in the room when trying to sleep). Good job folks. Simple, reliable and attractive.

There are many variables involved in solving a low airflow problem to the AC register in a particular room in your house. This product can solve some of the problems but not all so it depends on your particular situation. The fan will move more air out of your register and if your ducts are properly sealed it will pull that air from your airhandler where your AC coil is located and help to cool your room better. If your ducts are not sealed properly then it will not work so well as it will pull unconditioned air into the duct through the gaps at the duct joints instead of just pulling more conditioned air. You can measure the temperature of the air coming from your register and if it goes up when the booster fan is running then you probably have duct leaks that need to be sealed. Before you even turn the booster fan on you can measure the temperature of air coming out of your register from a room far from the air handler and also one near the air handler. If there is a large difference then your ducts may not be insulated and you are gaining heat into the ducts before the air gets to the farthest register. In conclusion when the duct work is not sized correctly for balanced airflow this fan can help boost the airflow to the problem room but unless the ducts are sealed and insulated properly the fan will not solve all your problems. There is a company called Aeroseal that can spray an aerosol sealant into a pressurized duct to seal it from the inside. This could help make the booster fan deliver more cold air in the summer or hot air in the winter to your problem room. It can also make your system more efficient and cheaper to operate. If you have access to your ducts you can seal them from the outside with a duct mastic and add insulation as needed. In my home the ducts were sized poorly and my second floor rooms were too hot in the summer. I added booster fans to the registers on the second floor. It helped only a little as I had leaky ducts. I closed off some of the registers on the first floor to get more flow to the second floor and that helped more but while I did not get the temperatures balanced between floors I was able to come close. You must be careful when closing registers on an AC system because if you restrict the airflow too much it can cause your AC coil to ice up. I also had returns on both floors so I closed off the one on the first floor so that all air returning to the air handler was coming from the second floor. This also helped to cool the second floor.