SPECSTAR Quiet Register Booster Fan 4'' x 10'' with Intelligent Thermostat 10-Speed Control, Heating Cooling AC Vent Booster Fan

I have 16 x 30‘ room heating system was not enough with the doc work order. The three of them saw them in the doc work amazing what a difference raise the room temperature by at least 15° now it's comfortable in this room. I was very skeptical about it, but they work wonderfully highly recommend them.

These will help your cooling system get air upstairs, or down, wherever you have a weak vent. Unfortunately, I have an old home and am all too familiar with these. I've been experimenting because I have 2" x 10" and 12" openings on many upstairs vents, which doesn't help. I have floor vents for most of them too so these do not natively fit. Instead I actually use the inner box the unit sits in, cut the bottom out, and use it as an adapter, works great. For the fan itself - 10 speeds, and it gets both more wind blowing from it and louder as it goes. We have large spaces to fill with high ceilings, so really without being at fan speed 5, it's not going to change what I have going on, but your mileage may vary depending on your particular situation. Real simple to use, left button selects the mode (cool, heat, fan speed) and the up and down lets you set the temperature to turn on and off. that's it. it'll save that info during a power outage. i set mine about 68 for AC and 78 for heat and that seems to work great, the HVAC blows AC at about 50 and the heat about 90 so i have the fan overlapping what the system actually does, there again, you need to watch it at your install to see what temps it sees and adjust a little until you get it set where you like it. These work well, there is another "floor style" that is actually single fan and more powerful, but they're over double the price of this unit. I am getting 75 to 80% of the performance for 50% of the price, I chose this. 2 of them actually.