***OFFICIAL 2026 WEATHER THREAD***

[iowastatefan1929]

I have a window AC for 2nd floor, granted I dont turn it on much because after some health and diet adjustments I can now sleep in the warm. But I also point a fan toward 2nd floor from main floor and that seems to help, especially if I pop a bathroom fan on in 2nd floor.

 

[Tailg8er]

But does the sensor do anything to control where the air is going?

We've got a decent sized 2-story w/finished basement... We had Dual Zone installed about 2 years ago and the difference has been wonderful.

No, pretty sure it just averages the two to decide when to run, but it's better than before we had it.

 

[Pope]

This morning, I ended up buying a couple powered vent covers that do this for about $60 each (Amazon). They have to be plugged into a wall, but luckily the two vents I want to use have outlets right by them. I'll let you know how they work.

https://www.amazon.com/dp/B07H8R5G1W?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

I've been doing some research since you suggested this. Unfortunately, we have 2x12" floor vents in our house, so we'd have to buy the kind of register booster fan that sits on top of our existing register vent, rather than replacing the vent. But I still think I might give this a try.

I'd love to hear your opinion after you try yours out!

 

[flycy]

If you have forced air heating, leave the furnace fan running 24/7. If the registers are balanced properly, this action should help even the temp throughout the house--may not completely solve the issue but will certainly help. I have geothermal which is slower to correct temperature differences because of the lower temps the furnace operates at, and except for a unit replacement a few years back, my furnace fan has been running 24/7 since the original install in 1995 simply to address this problem

Your new one will likely crap out in less than half the time. 30 years used to be no big deal. Quality has gone down so much in HVAC equipment.

 

[flycy]

I have a window AC for 2nd floor, granted I dont turn it on much because after some health and diet adjustments I can now sleep in the warm. But I also point a fan toward 2nd floor from main floor and that seems to help, especially if I pop a bathroom fan on in 2nd floor.

A bathroom fan is going to vent air outside likely through your attic and pull in outside air. Not very efficient.

 

[psychlone99]

Strongly recommend a good duct booster if you have uncomfortable spaces in an upper level. We've had a single AC Infinity unit in our second floor master bedroom for several years, and it makes a huge difference during the summer and winter. This week, you notice a big difference entering the room from the hallway. Much cooler than the rest of the upper level, and the room is much larger with vaulted ceilings.