• Suncourt Flush Fit Register Air Booster Fan - HC500-B - Brown - (2 Pack)
  • Suncourt Flush Fit Register Air Booster Fan - HC500-B - Brown - (2 Pack)
  • Suncourt Flush Fit Register Air Booster Fan - HC500-B - Brown - (2 Pack)
Suncourt Flush Fit Register Air Booster Fan - HC500-B - Brown - (2 Pack)
Suncourt Flush Fit Register Air Booster Fan - HC500-B - Brown - (2 Pack)
Suncourt Flush Fit Register Air Booster Fan - HC500-B - Brown - (2 Pack)

Suncourt Flush Fit Register Air Booster Fan - HC500-B - Brown - (2 Pack)

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MRP: €206,00
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€342,00
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per 
( 39% off )
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Expected Delivery: 21-28 days
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  • MAXIMIZE AIRFLOW - Enhance the performance of your existing furnace or air conditioner by boosting airflow up to 85%. Enhance your airflow--and comfort!
  • SAVE MONEY - Maximize the heating or air conditioning from your forced-air system with a minimum increase in energy use. Unit continues to run after your forced-air shuts off, pulling every bit of heat or cold air into your home.
  • QUIET OPERATION - Quiet, 3-speed dual fans increase airflow without excess noise.
  • EASY INSTALLATION - This unit drops directly into a standard 4" x 10" register without any modification. Optional adaptor available to purchase for wall installation. Not recommended for ceiling vents.
  • SET AND FORGET - Unit automatically switches on when airflow is sensed. All you have to do is set the fan speed and desired temperature.

Customer Reviews

Innovative and inexpensive solution to the cold room upstairs. We had an upstairs room cold in the winter and warm in the summer, you know the same problem everyone has with central heating and air systems. So your options to fix this with the experts duct fans and additional thermostats that are very expensive, or space heaters which are aways in the way and never on or off when you need them to be. Or try this innovative product which is two low voltage cooling fans attached to a thermostat built into a register. Wow a simple inexpensive solution exists and it has made a big difference in the bedroom. We have only had it a few days in the winter season but it has fixed my problem. I have been keeping an eye on it and noticed it doesn't come on with the heat until the thermostat is engaged by the hot air blowing thru the vent, and it runs long after the heat shuts off pulling all the remaining hot air out of the vent system. I set the fan on medium and the thermostat is in the middle and the room is as comfortable as the rest of the house. The sound level is about the same a a de-humitifier so we can live with it. 5A Good Investment I live in a three story townhouse and bought this product to help cool the bedrooms upstairs in the summer. It works exactly as advertised. I am a very light sleeper but don't find the noise to be an issue at all. Sounds much like the fan on your office computer. It kicks on and off as it is supposed to. The instructions also tell you how to keep the fans running for a while after the furnace fan clicks off and I do recommend you do that. There is cool air left in the ducts even once the central fan stops. It definitely helps to cool the room. Won't turn it into a meat locker but I'd say it provides a 20% boost or so. Remember that it's not actually cooling the air. It's pulling the cool air through the ducts.I do think a couple of the reviews may be outdated by changes in the product design. There are no tabs to remove that I could see but nothing to restrict the airflow either. 5Works Better than I Thought. Glad I bought it. Works pretty well. I did remove the back grilles as suggested here. It did help cut back on the noise. I noticed that the fans were 12v dc and the transformer output was also.I hooked it up to my 12v solar panels and battery bank and now I have it running without AC. The air output is easily doubled and now it's a few degrees warmer.I was surprised how well this worked. I could barely feel any air come out before and now it's a nice flow of warm air. 43 stars as is, 5 star if modified. As is this is an OK floor booster that really helps move extra air into a room. It has a pair of high-flow 92mm computer fans inside that best I can tell move about 55CFM each. I opened the unit up and some google-fu on the model numbers of the fans revealed the chinese supplier's site with specs. Really about 55 CFM is about the max air flow you can get out of 92mm fan. Collectively they move ~100 CFM of air with no obstructions. So the unit pushes *quite* a bit more air than the competition's offerings, at least on paper. That said these things are not miracles. Pretty much any in-vent booster will change the room's temperatures by about 5 degrees at most. This one has the CFM's to do about that. Its actually moves MUCH more air than Susncourt's booster model that sits over the vent.On the pro side the housing is very nice, a nice obstructive brown color and fits neatly into my 4"x10" vents for a neat flush look. The cord could bother people but I have a plug near buy so it doesn't bother me. The temperature control is pretty standard thermostat And the unit has nifty LED lit lights and push-button controls.Trouble is the housing isn't the most brilliant design. The first big con is the intake grills. On the bottom side of the unit they molded in little grills that reduce the area for the intakes to about 40% of the area of a 90 mm circle. As other have noted, removing these will GREATLY enhance airflow upto that 100 CFM max. Since its on the side that inside the vent this will have no effect at all for safety noise. Fortunately if you don't care about your warranty they snip off effortlessly with some wire cutters. The second major con is the fans themselves. They work great, but they have a lot of buzzing bearing nose. So in addition to the white-nose whoosh of air there will be a grating buzzing coming from the fan's motors. However they are standard. The buzzing was about the same volume as a conversational voice, or a running shower for reference. If they noise is worth an ~5 degree change in the room's temperature is upto you.Now I purchased with the intent to modify. This product uses standard 12volt (2 pin) 92mm computer fans with molex mini connectors. This means that any one of the plethora of 92mm computer case fans will effortlessly fit inside the housing and wire up with a little doing. I ended up purchasing a pair of 44CFM Arctic brand "PWM" fans based on their reported lose noise, cheap price, and decent CFM. With a delicate touch I disassembled the housing (the top just clips on with plastic hook style clips, and removed the stock fans. This entire unit has no screws, its all plastic clips that need a firm but gentle touch to pry back to unclip the various parts without breaking anything. I then released the crimp on connecters out of the plastic plugs from the artic fans, did the same with with the stock fans after noting the polarity of the wiring (red is + black wire is - ). Now the attic fans are PWM as mentioned so they had 4 wires, but 2 of those wires are for reporting to the motherboard to control fan speeds. They are not necessary. So Artic was kind enough to label their 4 wires as PWM, RPM, +, and - in the specs for the fan. I released the terminals out of the 4 pin plug housing, took the 2 pin plug housings from this unit, and moved them, thus converting the artic fans to 2 pin 12v fans. I snipped off the extra wires that are no longer need (as they will never be installed in a computer) plugged in the new fans and closed up the whole unit. It now moves ~80CFM of air and is nearly silent. Now the only thing I can hear is the white noise of moving air, the motors and bearings are below my ability to hear them.Another reviewer here mentioned they used noctura brand fans. Noctura makes the nicest fans in the PC market, but the Artic fans were Seven dollars each compared to the $ twenty one each that the noctura's were. Thus I am not too worried if not matching up the amp-raiting on Artic fans burns them out and I need to replace them in 6 months or so.But yes I am happy with my purchase. I bought this for the housing and 12vot power system with the idea that I would be replacing the industrial grade, noisy fans. The fans suncourt picked would have been great for a server room where you could care less about noise, but pretty bad for a residential product. 4Good value for the money. Be sure to remove the rear air grates! First and foremost, I want everyone to understand that this is NOT an air conditioner or furnace, nor does it create colder or warmer air. All it does (and claims to do) is move a little more air out of a weak register. Another thing...do NOT expect this unit to be as quiet as your old register. Your old register didn't have 2 fans running...this register will. Anyone expecting to spend $35 and solve an entire room's HVAC problems has extremely unrealistic expectations.That said, this unit has worked decently for my HVAC needs. I live in a 3-level condo, where the bottom floor will normally have a 10-degree difference from the top. Unfortunately, the top floor happens to be the bedroom, the one room that temperature actually matters. Rather than do some extensive modifications to the house, I figured I'd give this unit a shot.It's a pretty cut and dry operation, with an on, off, auto-heat and auto-cool setting. The latter 3 settings all have low-medium-high fan settings. From the way some people were talking, I was expecting this thing to possibly sound like a box fan, though I was relieved to find it to be much quieter than that. It was, however, still noticeable when it was on. Airflow was maybe 50% better than without, although it didn't quite seem as powerful as I was hoping. I'm almost positive that these fans are almost interchangeable parts with a computer CPU fan. The Auto Heat/Cool functions are nice, but take a good amount of tweaking before you get them in the right place. Be prepared to have to make at least 3-4 adjustments, minimum.After doing some other research, I found that many people have come up with an answer to the semi-noisy fans, and I figured that I would try it myself. If you turn the register over and cut the air grates off the backside, it will make a drastic improvement on noise. (See attached picture) I would go as far as to say it's a 50-75% improvement of overall noise. People also claimed a 50% improvement on airflow, although I personally found it to be maybe 25% better, if that. I would, however, HIGHLY recommend this modification if your primary complaint about the register is how much noise it makes. One word of caution though...this modification will likely void your warranty, and you will NOT be able to return the item. Choose wisely.Lastly, I bought this as an open-box item and got it quite a bit less from Smarthome. When it showed up, I couldn't even tell it had been opened. It was probably from someone who didn't care for the noise and was a like-new return. If I were looking to pick up one of these, I would strongly consider an open box item.Summary:PROS:-Works fairly well (4-6 degree difference on 3rd floor home)-Quiet after modification-Good value given other expensive options-Auto Heat/Cool functionsCONS:-Semi-noisy fans if left unmodded-Somewhat short cord-AC adaptor gets pretty warm-Auto Heat/Cool takes some tweakingFinal Thoughts:I would definitely recommend this for around $30. If you pay $50, it's getting a little steep. If you're afraid to cut off the rear air grates, you may not care as much for this product, as it yields a drastic difference in the noise level. 4This product is amazing! This product completely exceeded my expectations. I live in a three story condo in the South that is about 10 years old. Many friends who are knowledgeable about housing/HVAC have told me the builders cheaped out on our HVAC system and it is noticeable even though the house has good insulation, a radiant barrier in the attic, and energy saving window covering.The last two summers have been even hotter than usual and my master bedroom is on, you guessed it, the third floor. All of July, August, and most of September I couldn't sleep in my room while the rest of the house was comfortably cool. Even turning down the AC to 68 didn't cool it down enough (but froze the rest of the house). I even got new blackout/insulated curtains which did lower the temperature, but not enough so I could sleep upstairs. Seeing the good reviews on the product (and the price) convinced me to try it. I figured it would make it more bearable for when I HAVE TO be upstairs and would maybe get me back in my bedroom a week or two earlier when it starts to cool down. I was blown away at how much and how fast this cooled down the sauna that was my (very large) master bedroom! I was able to sleep in my bedroom all of August (and it was just as hot)! My only regret is that I wish I ordered this sooner! Order it! You will not be disappointed! Between this and the electric fireplace in my downstairs, I have beat the cheap HVAC problem completely!Some people complained about the noise. I was worried about that, and yes, if you listen for it, you can hear it when the AC is on. If you can sleep with the noise of a ceiling fan, you can handle this (and I'm a youngster, so my hearing is fine). 5Really Helpful if not a Perfect Solution These have been really helping cool and heat our house over the last 6 months. I live in an old house without any dedicated ducts for the upstairs. What ends up upstairs is air that comes up from the basement, is released through vents on the 1st floor and then trickles up to the 2nd floor. Vent fans are probably more powerful and would do a better job, but they would be a expensive to install professionally, and, because I have a tight crawl space where they would need to go, I don't want to and probably wouldn't be able to install them myself.Cut to the booster fans... These are a cheaper option and they really to make a big difference -- though not perfect. In the summer, they kept my upstairs bedrooms cooler, and so far this winter they have made the rooms warmer. If you do not keep them on all the time, I would recommend that you turn them on early enough (before spending time in the room you want to heat/cool). We use the auto function, which works well (once you tweak it) so that it turns on when the heat or air kicks in.Maybe someday we'll invest in duct fans or even go all the way and add new lines directly to the upstairs. But for now, instead of spending hundreds or thousands of dollars, these help.Tip 1: For me, it works best to close the door to the room the booster is in, to trap the air you want to heat/cool.Tip 2: I have 5 of these (well 3 of these, and 2 of the boxier kind). I use two downstairs to get a better flowing coming in from the basement, and 3 upstairs, in the bedroom, to pull up the rooms I most need to regulate the air in. 4I loved the concept, but needs improvement Overall, it's a great concept but I did have to return mine. It turns out the sensors that control the fans only operate when there has been difference of several degrees in between the AC/Heat turning on. My AC kicks on when the temperature falls two degrees. The two degree change is not enough for the sensor on the Booster to recognize the AC has turned back on and therefore they do not operate. The only way for these function in my house is to leave them on at all times. They are far too noisy for that to be a viable option.I used a decibel (dB) reader to take some measurements. When my AC is not running, the reading at the vent is 30dB. When the AC turns on but the Booster fans are off the dB reading is 58dB. That is normal for an AC. With the Booster fans on low, the dB reading increases to 78.7 (+21.4dB), and 84.7dB (+27.4db) on high. That is equivalent to the dB's of a vacuum cleaner or hair dryer. Set to low, my hair dryer registers 83dB. In my opinion, these are too noisy for a living room or bedroom.I read some reviews where people modified the housing and changed out the fans to improve the noise. Hopefully the developer will go back to the drawing board and improve their temperature change sensor and install quieter fans. 3Works great in our application Purchased two (2) to replace register boosters we have been using to bring warm air up through two small ducts from a lower level where our pellet stove is to the next floor in our house. These have worked quite well so far. They make about the same amount of noise as the register boosters but appear to work better (e.g. - they appear to move more air) and they have the advantage that they are now embedded in the register so they are not in the way on the floor like the register boosters. The noise is not overwhelming (we also run a humidifier in the winter down the hallway so these just add to the "white noise" in the environment) but it is noticeable, both in the hallway where they are located and in the room below where our main TV is located. Purchased the brown ones to more closely match the hardwood flooring. We use them in "constant on" mode since our pellet stove runs 24x7 during the winter. We plan on storing them for spring / summer / fall and just putting the register covers in their place at that time when they are not in use. Overall, very pleased with the purchase. 5works as advertised, but not quite perfect I purchased this fan to augment the flow from an under performing basement vent.This made a huge difference. My basement is finished, but gets such poor airflow that it was about 15 degrees cooler than the rest of the house. With this fan operating it is about the same temperature as the main floor.I purchased one of these units as a trial and just ordered a second for another basement vent.The ability to set the fan to come on when the heating or cooling operates is nice, that way it augments the airflow. It does take quite a bit of tweaking to set properly. I have also turned the fan on; it pulls air from the rest of the house and makes a big difference as well.The fan uses a thermocouple in the airflow to sense when the heat or AC is operating. I have a thermostat that runs the furnace fan to circulate air without operating the heat or AC. I have doubts about this fan being able to sense this airflow.The fan is fairly noisy. If you take a pair of dikes and cut the fan covers off of the rear of the unit, the airflow improves by about 50% and the noise is reduced about 75%. My fan is located right above the couch in the TV area of my basement. With those covers removed the fan noise is easily ignored. I do not notice it at all.The plastic shell of this unit has small circular pieces on the short sides. They line up perfectly for screws to mount the unit in a ceiling vent. I did so and it works just fine.The LED indicators on the unit are very bright. I agree with one of the other reviews: a bit of duct or electrical tape can cover those up nicely.The power supply that comes with the unit is junk it seems to weight about half a pound and gets fairly hot. I spent $7on a level 5 energy efficiency rated switching power supply from Digikey - part number T983-P5P. The power supply needs to be 12V with at least 500mA output. The plug is standard DC power plug: center positive, 5.5 mm outer diameter, 2.1 mm inner diameter.* Amazon and Digikey carry DC extension cords that fit the above connector. I bought part number CP-2213 from Digikey. Has the same right angle connection of the original power supply. 4
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Reviews

Customer Reviews

Innovative and inexpensive solution to the cold room upstairs. We had an upstairs room cold in the winter and warm in the summer, you know the same problem everyone has with central heating and air systems. So your options to fix this with the experts duct fans and additional thermostats that are very expensive, or space heaters which are aways in the way and never on or off when you need them to be. Or try this innovative product which is two low voltage cooling fans attached to a thermostat built into a register. Wow a simple inexpensive solution exists and it has made a big difference in the bedroom. We have only had it a few days in the winter season but it has fixed my problem. I have been keeping an eye on it and noticed it doesn't come on with the heat until the thermostat is engaged by the hot air blowing thru the vent, and it runs long after the heat shuts off pulling all the remaining hot air out of the vent system. I set the fan on medium and the thermostat is in the middle and the room is as comfortable as the rest of the house. The sound level is about the same a a de-humitifier so we can live with it. 5A Good Investment I live in a three story townhouse and bought this product to help cool the bedrooms upstairs in the summer. It works exactly as advertised. I am a very light sleeper but don't find the noise to be an issue at all. Sounds much like the fan on your office computer. It kicks on and off as it is supposed to. The instructions also tell you how to keep the fans running for a while after the furnace fan clicks off and I do recommend you do that. There is cool air left in the ducts even once the central fan stops. It definitely helps to cool the room. Won't turn it into a meat locker but I'd say it provides a 20% boost or so. Remember that it's not actually cooling the air. It's pulling the cool air through the ducts.I do think a couple of the reviews may be outdated by changes in the product design. There are no tabs to remove that I could see but nothing to restrict the airflow either. 5Works Better than I Thought. Glad I bought it. Works pretty well. I did remove the back grilles as suggested here. It did help cut back on the noise. I noticed that the fans were 12v dc and the transformer output was also.I hooked it up to my 12v solar panels and battery bank and now I have it running without AC. The air output is easily doubled and now it's a few degrees warmer.I was surprised how well this worked. I could barely feel any air come out before and now it's a nice flow of warm air. 43 stars as is, 5 star if modified. As is this is an OK floor booster that really helps move extra air into a room. It has a pair of high-flow 92mm computer fans inside that best I can tell move about 55CFM each. I opened the unit up and some google-fu on the model numbers of the fans revealed the chinese supplier's site with specs. Really about 55 CFM is about the max air flow you can get out of 92mm fan. Collectively they move ~100 CFM of air with no obstructions. So the unit pushes *quite* a bit more air than the competition's offerings, at least on paper. That said these things are not miracles. Pretty much any in-vent booster will change the room's temperatures by about 5 degrees at most. This one has the CFM's to do about that. Its actually moves MUCH more air than Susncourt's booster model that sits over the vent.On the pro side the housing is very nice, a nice obstructive brown color and fits neatly into my 4"x10" vents for a neat flush look. The cord could bother people but I have a plug near buy so it doesn't bother me. The temperature control is pretty standard thermostat And the unit has nifty LED lit lights and push-button controls.Trouble is the housing isn't the most brilliant design. The first big con is the intake grills. On the bottom side of the unit they molded in little grills that reduce the area for the intakes to about 40% of the area of a 90 mm circle. As other have noted, removing these will GREATLY enhance airflow upto that 100 CFM max. Since its on the side that inside the vent this will have no effect at all for safety noise. Fortunately if you don't care about your warranty they snip off effortlessly with some wire cutters. The second major con is the fans themselves. They work great, but they have a lot of buzzing bearing nose. So in addition to the white-nose whoosh of air there will be a grating buzzing coming from the fan's motors. However they are standard. The buzzing was about the same volume as a conversational voice, or a running shower for reference. If they noise is worth an ~5 degree change in the room's temperature is upto you.Now I purchased with the intent to modify. This product uses standard 12volt (2 pin) 92mm computer fans with molex mini connectors. This means that any one of the plethora of 92mm computer case fans will effortlessly fit inside the housing and wire up with a little doing. I ended up purchasing a pair of 44CFM Arctic brand "PWM" fans based on their reported lose noise, cheap price, and decent CFM. With a delicate touch I disassembled the housing (the top just clips on with plastic hook style clips, and removed the stock fans. This entire unit has no screws, its all plastic clips that need a firm but gentle touch to pry back to unclip the various parts without breaking anything. I then released the crimp on connecters out of the plastic plugs from the artic fans, did the same with with the stock fans after noting the polarity of the wiring (red is + black wire is - ). Now the attic fans are PWM as mentioned so they had 4 wires, but 2 of those wires are for reporting to the motherboard to control fan speeds. They are not necessary. So Artic was kind enough to label their 4 wires as PWM, RPM, +, and - in the specs for the fan. I released the terminals out of the 4 pin plug housing, took the 2 pin plug housings from this unit, and moved them, thus converting the artic fans to 2 pin 12v fans. I snipped off the extra wires that are no longer need (as they will never be installed in a computer) plugged in the new fans and closed up the whole unit. It now moves ~80CFM of air and is nearly silent. Now the only thing I can hear is the white noise of moving air, the motors and bearings are below my ability to hear them.Another reviewer here mentioned they used noctura brand fans. Noctura makes the nicest fans in the PC market, but the Artic fans were Seven dollars each compared to the $ twenty one each that the noctura's were. Thus I am not too worried if not matching up the amp-raiting on Artic fans burns them out and I need to replace them in 6 months or so.But yes I am happy with my purchase. I bought this for the housing and 12vot power system with the idea that I would be replacing the industrial grade, noisy fans. The fans suncourt picked would have been great for a server room where you could care less about noise, but pretty bad for a residential product. 4Good value for the money. Be sure to remove the rear air grates! First and foremost, I want everyone to understand that this is NOT an air conditioner or furnace, nor does it create colder or warmer air. All it does (and claims to do) is move a little more air out of a weak register. Another thing...do NOT expect this unit to be as quiet as your old register. Your old register didn't have 2 fans running...this register will. Anyone expecting to spend $35 and solve an entire room's HVAC problems has extremely unrealistic expectations.That said, this unit has worked decently for my HVAC needs. I live in a 3-level condo, where the bottom floor will normally have a 10-degree difference from the top. Unfortunately, the top floor happens to be the bedroom, the one room that temperature actually matters. Rather than do some extensive modifications to the house, I figured I'd give this unit a shot.It's a pretty cut and dry operation, with an on, off, auto-heat and auto-cool setting. The latter 3 settings all have low-medium-high fan settings. From the way some people were talking, I was expecting this thing to possibly sound like a box fan, though I was relieved to find it to be much quieter than that. It was, however, still noticeable when it was on. Airflow was maybe 50% better than without, although it didn't quite seem as powerful as I was hoping. I'm almost positive that these fans are almost interchangeable parts with a computer CPU fan. The Auto Heat/Cool functions are nice, but take a good amount of tweaking before you get them in the right place. Be prepared to have to make at least 3-4 adjustments, minimum.After doing some other research, I found that many people have come up with an answer to the semi-noisy fans, and I figured that I would try it myself. If you turn the register over and cut the air grates off the backside, it will make a drastic improvement on noise. (See attached picture) I would go as far as to say it's a 50-75% improvement of overall noise. People also claimed a 50% improvement on airflow, although I personally found it to be maybe 25% better, if that. I would, however, HIGHLY recommend this modification if your primary complaint about the register is how much noise it makes. One word of caution though...this modification will likely void your warranty, and you will NOT be able to return the item. Choose wisely.Lastly, I bought this as an open-box item and got it quite a bit less from Smarthome. When it showed up, I couldn't even tell it had been opened. It was probably from someone who didn't care for the noise and was a like-new return. If I were looking to pick up one of these, I would strongly consider an open box item.Summary:PROS:-Works fairly well (4-6 degree difference on 3rd floor home)-Quiet after modification-Good value given other expensive options-Auto Heat/Cool functionsCONS:-Semi-noisy fans if left unmodded-Somewhat short cord-AC adaptor gets pretty warm-Auto Heat/Cool takes some tweakingFinal Thoughts:I would definitely recommend this for around $30. If you pay $50, it's getting a little steep. If you're afraid to cut off the rear air grates, you may not care as much for this product, as it yields a drastic difference in the noise level. 4This product is amazing! This product completely exceeded my expectations. I live in a three story condo in the South that is about 10 years old. Many friends who are knowledgeable about housing/HVAC have told me the builders cheaped out on our HVAC system and it is noticeable even though the house has good insulation, a radiant barrier in the attic, and energy saving window covering.The last two summers have been even hotter than usual and my master bedroom is on, you guessed it, the third floor. All of July, August, and most of September I couldn't sleep in my room while the rest of the house was comfortably cool. Even turning down the AC to 68 didn't cool it down enough (but froze the rest of the house). I even got new blackout/insulated curtains which did lower the temperature, but not enough so I could sleep upstairs. Seeing the good reviews on the product (and the price) convinced me to try it. I figured it would make it more bearable for when I HAVE TO be upstairs and would maybe get me back in my bedroom a week or two earlier when it starts to cool down. I was blown away at how much and how fast this cooled down the sauna that was my (very large) master bedroom! I was able to sleep in my bedroom all of August (and it was just as hot)! My only regret is that I wish I ordered this sooner! Order it! You will not be disappointed! Between this and the electric fireplace in my downstairs, I have beat the cheap HVAC problem completely!Some people complained about the noise. I was worried about that, and yes, if you listen for it, you can hear it when the AC is on. If you can sleep with the noise of a ceiling fan, you can handle this (and I'm a youngster, so my hearing is fine). 5Really Helpful if not a Perfect Solution These have been really helping cool and heat our house over the last 6 months. I live in an old house without any dedicated ducts for the upstairs. What ends up upstairs is air that comes up from the basement, is released through vents on the 1st floor and then trickles up to the 2nd floor. Vent fans are probably more powerful and would do a better job, but they would be a expensive to install professionally, and, because I have a tight crawl space where they would need to go, I don't want to and probably wouldn't be able to install them myself.Cut to the booster fans... These are a cheaper option and they really to make a big difference -- though not perfect. In the summer, they kept my upstairs bedrooms cooler, and so far this winter they have made the rooms warmer. If you do not keep them on all the time, I would recommend that you turn them on early enough (before spending time in the room you want to heat/cool). We use the auto function, which works well (once you tweak it) so that it turns on when the heat or air kicks in.Maybe someday we'll invest in duct fans or even go all the way and add new lines directly to the upstairs. But for now, instead of spending hundreds or thousands of dollars, these help.Tip 1: For me, it works best to close the door to the room the booster is in, to trap the air you want to heat/cool.Tip 2: I have 5 of these (well 3 of these, and 2 of the boxier kind). I use two downstairs to get a better flowing coming in from the basement, and 3 upstairs, in the bedroom, to pull up the rooms I most need to regulate the air in. 4I loved the concept, but needs improvement Overall, it's a great concept but I did have to return mine. It turns out the sensors that control the fans only operate when there has been difference of several degrees in between the AC/Heat turning on. My AC kicks on when the temperature falls two degrees. The two degree change is not enough for the sensor on the Booster to recognize the AC has turned back on and therefore they do not operate. The only way for these function in my house is to leave them on at all times. They are far too noisy for that to be a viable option.I used a decibel (dB) reader to take some measurements. When my AC is not running, the reading at the vent is 30dB. When the AC turns on but the Booster fans are off the dB reading is 58dB. That is normal for an AC. With the Booster fans on low, the dB reading increases to 78.7 (+21.4dB), and 84.7dB (+27.4db) on high. That is equivalent to the dB's of a vacuum cleaner or hair dryer. Set to low, my hair dryer registers 83dB. In my opinion, these are too noisy for a living room or bedroom.I read some reviews where people modified the housing and changed out the fans to improve the noise. Hopefully the developer will go back to the drawing board and improve their temperature change sensor and install quieter fans. 3Works great in our application Purchased two (2) to replace register boosters we have been using to bring warm air up through two small ducts from a lower level where our pellet stove is to the next floor in our house. These have worked quite well so far. They make about the same amount of noise as the register boosters but appear to work better (e.g. - they appear to move more air) and they have the advantage that they are now embedded in the register so they are not in the way on the floor like the register boosters. The noise is not overwhelming (we also run a humidifier in the winter down the hallway so these just add to the "white noise" in the environment) but it is noticeable, both in the hallway where they are located and in the room below where our main TV is located. Purchased the brown ones to more closely match the hardwood flooring. We use them in "constant on" mode since our pellet stove runs 24x7 during the winter. We plan on storing them for spring / summer / fall and just putting the register covers in their place at that time when they are not in use. Overall, very pleased with the purchase. 5works as advertised, but not quite perfect I purchased this fan to augment the flow from an under performing basement vent.This made a huge difference. My basement is finished, but gets such poor airflow that it was about 15 degrees cooler than the rest of the house. With this fan operating it is about the same temperature as the main floor.I purchased one of these units as a trial and just ordered a second for another basement vent.The ability to set the fan to come on when the heating or cooling operates is nice, that way it augments the airflow. It does take quite a bit of tweaking to set properly. I have also turned the fan on; it pulls air from the rest of the house and makes a big difference as well.The fan uses a thermocouple in the airflow to sense when the heat or AC is operating. I have a thermostat that runs the furnace fan to circulate air without operating the heat or AC. I have doubts about this fan being able to sense this airflow.The fan is fairly noisy. If you take a pair of dikes and cut the fan covers off of the rear of the unit, the airflow improves by about 50% and the noise is reduced about 75%. My fan is located right above the couch in the TV area of my basement. With those covers removed the fan noise is easily ignored. I do not notice it at all.The plastic shell of this unit has small circular pieces on the short sides. They line up perfectly for screws to mount the unit in a ceiling vent. I did so and it works just fine.The LED indicators on the unit are very bright. I agree with one of the other reviews: a bit of duct or electrical tape can cover those up nicely.The power supply that comes with the unit is junk it seems to weight about half a pound and gets fairly hot. I spent $7on a level 5 energy efficiency rated switching power supply from Digikey - part number T983-P5P. The power supply needs to be 12V with at least 500mA output. The plug is standard DC power plug: center positive, 5.5 mm outer diameter, 2.1 mm inner diameter.* Amazon and Digikey carry DC extension cords that fit the above connector. I bought part number CP-2213 from Digikey. Has the same right angle connection of the original power supply. 4
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