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forum thread Posted by GreyFlower2145 • Apr 21, 2024
forum thread Posted by GreyFlower2145 • Apr 21, 2024

Honeywell Home T9 WiFi Smart Thermostat with 1 Smart Room Sensor, Touchscreen Display $139.99

$140

$210

33% off
Amazon
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almost the lowest price ever on amazon according to the 3 humps

https://www.amazon.com/Honeywell-...B07N849J21
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almost the lowest price ever on amazon according to the 3 humps

https://www.amazon.com/Honeywell-...B07N849J21

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Model: Honeywell Home RCHT9610WF T9 Smart Thermostat with Smart Room Sensor

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Sort: Lowest to Highest | Last Updated 6/21/2025, 04:09 AM
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Apr 21, 2024
593 Posts
Joined Dec 2011
Apr 21, 2024
sri69
Apr 21, 2024
593 Posts
Honeywell home seems to have the same unit for $102. Just purchased one from Honeywell directly and a second one from the utility for $49 based on an instant rebate.
Thanks for posting about this unit, would not have noticed the sale.
Apr 21, 2024
740 Posts
Joined Nov 2013
Apr 21, 2024
NinjaGrunt
Apr 21, 2024
740 Posts
With a central HVAC setup, what do the room sensors do?

In a setup without room sensors, the HVAC would need to wait for the area where the thermostat is to reach a certain threshold for it to kick in, but with room sensors, it's able to kick in sooner as it's sensing thresholds in multiple different area?

If you leave ceiling fans running on low all the time to circulate air and keep temps even throughout the home, do the sensors add any benefit?

One room of my home gets blasted by the afternoon sun, therefore it's significantly warmer than the rest of the home in the summer time (like average 4 degrees warmer). If I have guests staying there, they will keep the door closed and the problem gets worse fast, as that warmth doesn't get recirculated into the home forcing the A/C to cool it better.

I had the HVAC company install a "damper" (I think is what it's called) to reduce the flow of one area which, in theory, should increase the flow to another area. This was done to try to improve the amount of air being pushed into that warmer room. Its only made a small difference. What do folks recommend for this?
Apr 21, 2024
593 Posts
Joined Dec 2011
Apr 21, 2024
sri69
Apr 21, 2024
593 Posts
Quote from NinjaGrunt :
With a central HVAC setup, what do the room sensors do?

In a setup without room sensors, the HVAC would need to wait for the area where the thermostat is to reach a certain threshold for it to kick in, but with room sensors, it's able to kick in sooner as it's sensing thresholds in multiple different area?

If you leave ceiling fans running on low all the time to circulate air and keep temps even throughout the home, do the sensors add any benefit?

One room of my home gets blasted by the afternoon sun, therefore it's significantly warmer than the rest of the home in the summer time (like average 4 degrees warmer). If I have guests staying there, they will keep the door closed and the problem gets worse fast, as that warmth doesn't get recirculated into the home forcing the A/C to cool it better.

I had the HVAC company install a "damper" (I think is what it's called) to reduce the flow of one area which, in theory, should increase the flow to another area. This was done to try to improve the amount of air being pushed into that warmer room. Its only made a small difference. What do folks recommend for this?
My understanding with the T9 and T10 Honeywell/Resideo is that you can set which rooms/sensors have the priority temperature or you can choose to average multiple sensor temps and operate based on that average instead of a solo location reading. In theory, that should balance the temp somewhat especially if the main thermostat is in a particularly cold or warm location.
Last edited by sri69 April 21, 2024 at 03:21 PM.
Apr 22, 2024
49 Posts
Joined Dec 2013
Apr 22, 2024
b333v333
Apr 22, 2024
49 Posts
Quote from sri69 :
Honeywell home seems to have the same unit for $102. Just purchased one from Honeywell directly and a second one from the utility for $49 based on an instant rebate.
Thanks for posting about this unit, would not have noticed the sale.
What do you mean 2nd one from utility?
Apr 22, 2024
593 Posts
Joined Dec 2011
Apr 22, 2024
sri69
Apr 22, 2024
593 Posts
Quote from b333v333 :
What do you mean 2nd one from utility?
A two zone system. So needed two separate thermostats. 2nd unit purchase through the electrical utility.company purchase portal at a significant discount immediately.
Jun 14, 2024
1,654 Posts
Joined Dec 2010
Jun 14, 2024
britdude
Jun 14, 2024
1,654 Posts
Quote from NinjaGrunt :
With a central HVAC setup, what do the room sensors do?

In a setup without room sensors, the HVAC would need to wait for the area where the thermostat is to reach a certain threshold for it to kick in, but with room sensors, it's able to kick in sooner as it's sensing thresholds in multiple different area?

If you leave ceiling fans running on low all the time to circulate air and keep temps even throughout the home, do the sensors add any benefit?

One room of my home gets blasted by the afternoon sun, therefore it's significantly warmer than the rest of the home in the summer time (like average 4 degrees warmer). If I have guests staying there, they will keep the door closed and the problem gets worse fast, as that warmth doesn't get recirculated into the home forcing the A/C to cool it better.

I had the HVAC company install a "damper" (I think is what it's called) to reduce the flow of one area which, in theory, should increase the flow to another area. This was done to try to improve the amount of air being pushed into that warmer room. Its only made a small difference. What do folks recommend for this?
You need to put in a return in that room to suck out the hot air. This will improve circulation and even out the temperature.

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