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Smart Thermostat Recommendation

Posted on 11/5/24 at 2:52 pm
Posted by lipripper32413
Baton Rouge
Member since Aug 2019
47 posts
Posted on 11/5/24 at 2:52 pm
I currently have a nest 3rd gen thermostat with 3 temperature sensors. I find that the sensors are not accurate and the system will run for wayyy too long once the system reaches temp, often a degree or two cooler than it is set at. Not a problem when we are home, but when we are not I often feel like if we had something more accurate the unit would not run so hard. Open to trying the newer gen nest if anyone seems to think they have made an improvement. Thanks!
Posted by Korkstand
Member since Nov 2003
28996 posts
Posted on 11/5/24 at 3:26 pm to
Is "cool to dry" turned on? If so that will cause it to keep cooling in order to drop the humidity.
Posted by LemmyLives
Texas
Member since Mar 2019
9950 posts
Posted on 11/5/24 at 4:38 pm to
It’s trying to protect your hvac by limiting the on off cycles. I’ve had four or five brands of smart thermostats and they’ve all done this. Set it at 72, it may cool to 71, let them temp rise and then kick back on. If it stopped at 72 for cooling it would be turning on every ten minutes.

I’ve never tried to turn the functionality off in any of the brands, don’t know if it’s possible.
Posted by Skippy1013
Lafayette, La
Member since Oct 2017
689 posts
Posted on 11/5/24 at 5:07 pm to
Honeywell
Posted by lipripper32413
Baton Rouge
Member since Aug 2019
47 posts
Posted on 11/6/24 at 7:59 am to
Cool to dry is not turned on
Posted by Joshjrn
Baton Rouge
Member since Dec 2008
29858 posts
Posted on 11/6/24 at 10:16 am to
That’s normal behavior. The hysteresis point is one degree below your set point. If you have the Airwave setting on, which you should, it will sometimes drop two degrees below point, but your compressor is already off by that point.
Posted by Fat Batman
Gotham City, NJ
Member since Oct 2019
1554 posts
Posted on 11/6/24 at 10:40 am to
Probably not helpful to solving your issue, but general question, how do the sensors work? Is it the "most off temp sensor" wins and the ac runs until it is satisfied, or maybe it creates some average between all of them? There are so many variables with air flow, room characteristics, sensor placement, etc. that I would imagine its likely the sensors are never reporting the same temp.

I think a degree colder is normal for the reasons stated above. How do you know the sensors are not accurate? have you measured temp at each sensor and checked against sensor reading?
Posted by LemmyLives
Texas
Member since Mar 2019
9950 posts
Posted on 11/6/24 at 11:27 am to
quote:

hysteresis


You with the five dollar words, lol. That sounds like it applies to female behavior.
Posted by gpburdell
ATL
Member since Jun 2015
1551 posts
Posted on 11/6/24 at 11:32 am to
I have both a Nest and Ecobee on different floors in my house. The Ecobee allows alot more customizations to how it works.

For example, you can set things like
-compressor minimum run time
-compressor minimum cycle off time
-heat/cool delta before it starts
-humidity/temp correction

https://support.ecobee.com/s/articles/Threshold-settings-for-ecobee-thermostats

The Nest doesn't allow any of that. The mobile app/UI for Ecobee is much better than Nest too.

Fyi, I don't use any of the smart learning modes on either unit. So I can't speak to how that performs. I set schedules based on typical usage. Again the Ecobee works much better, when I want to deviate from that schedule.

When the Nest dies, I will replace with another Ecobee.

Lastly with Ecobee, if you are someone who likes data/stats. This site lets you get access to alot more data that the Ecobee stores which isn't available thru the app:
https://beestat.io/
Posted by MMauler
Primary This RINO Traitor
Member since Jun 2013
22359 posts
Posted on 11/6/24 at 11:34 am to
I have the Ecobee and really like it. Like you mentioned, I pretty much use the app almost exclusively. It is really convenient and allows you to do pretty much everything.
This post was edited on 11/6/24 at 11:58 am
Posted by Joshjrn
Baton Rouge
Member since Dec 2008
29858 posts
Posted on 11/6/24 at 2:08 pm to
quote:

You with the five dollar words, lol. That sounds like it applies to female behavior.

That’s the word; don’t blame me
Posted by Shepherd
Member since Nov 2009
3043 posts
Posted on 11/6/24 at 5:14 pm to
Ecobee
Posted by Sl0thstronautEsq
Antarctica
Member since Aug 2018
13031 posts
Posted on 11/7/24 at 4:28 pm to
Another vote for ecobee here.
Posted by busbeepbeep
When will then be now?
Member since Jan 2004
19130 posts
Posted on 11/7/24 at 4:53 pm to
quote:

have both a Nest and Ecobee on different floors in my house. The Ecobee allows alot more customizations to how it works.

For example, you can set things like
-compressor minimum run time
-compressor minimum cycle off time
-heat/cool delta before it starts
-humidity/temp correction

I installed an Ecobee Premium and haven't messed with any advanced settings. What are the recommended settings for the compressor run and cycle time? Bought house a little over a year ago, has basic contractor grade Goodman unit. Is it something I should look up in paperwork for the compressor?
Posted by turkish
Member since Aug 2016
2099 posts
Posted on 11/8/24 at 6:15 pm to
Ecobee.

With Beestat, it’s an engineer’s t-stat!
Posted by Coater
Madison, MS
Member since Jun 2005
33329 posts
Posted on 11/11/24 at 2:56 pm to
quote:

hysteresis

You with the five dollar words, lol. That sounds like it applies to female behavior.


Sounds like when you laugh so hard a little pee comes out
Posted by tigersmanager
Member since Jun 2010
8122 posts
Posted on 11/11/24 at 3:55 pm to
ecobee just make sure to turn off eco plus
Posted by BilbeauTBaggins
probably stuck in traffic
Member since May 2021
7129 posts
Posted on 11/11/24 at 9:28 pm to
We have had the nest learning thermostat for about 5 years now. I like that it is able to pick up my habits on when I want the air cooled. I've even set up schedules so that it's cooling to the temp I want for bed time. It's also nice to have it kick on when I get home when it picks up my phone.

That being said, the sensors and actual thermostat should just be thermometers that take readings and give the information back to your main thermostat, then it'll shut down when it reaches your desired temp.

The air will generally be one degree cooler, not sure why, but I believe that's because it will give your unit some time to relax before it kicks back on again.

For instance, if you want it at 72 degrees, you wouldn't want it to shut down immediately as it hits 72. The moment it goes above that, it'll just cycle your unit on and off, on and off, wearing it out.

Just have it 1 degree above what you want.
Posted by Fat Batman
Gotham City, NJ
Member since Oct 2019
1554 posts
Posted on 11/11/24 at 10:08 pm to
Yeah but if you have 4 sensors including the thermostat all giving different temps how does it decide when to turn off?You could have one in the kitchen while youre cooking reading 75, on in the open living room with windows facing the sun reading 73, one in a dark bedroom in the back reading 68, and your thermostat in a central, but somewhat protected location reading 70. Nest says you can prioritize a sensor or set an average between all of them to turn on/off the AC. OP hasn't stated how/why he believes the sensors aren't accurate, how he has the sensors setup or what running way too long means. My guess is OP bought 3 extra sensors and doesn't understand how they work with the thermostat.
Posted by BilbeauTBaggins
probably stuck in traffic
Member since May 2021
7129 posts
Posted on 11/11/24 at 11:57 pm to
Could also be the placement of the sensors. Not enough adequate airflow or the sensors could be facing the sun.
This post was edited on 11/11/24 at 11:58 pm
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