Posted by
Message
LSUDbrous90
LSU Fan
Lafayette
Member since Dec 2011
1268 posts

Smart Thermostat Argument with HVAC Tech
Mother-in-law owns a business that has three thermostats and right now she typically has to come and go before someone arrives to get the units on and cool the building down (or warm it up). I recommended to her replacing the three thermostats with smart or at a minimum wifi thermostats so that she could do it remotely. I was going to put three of the $125 nest thermostats in nbd. I had a few questions for her AC guy and he went on this rant about how he never recommends them and they will burn up the units etc. He is an older guy and most likely has an old school thinking but I wanted to make sure I am not wrong here.

After doing a bunch of research I think he is wrong and everything will be fine as I plan to install the nests using the C wire which if it was installed without the C wire was the only issue I could really find. He recommended a sensi which the only difference I could figure compatability wise is that the sensi requires a C wire. Is he wrong in saying it will frick things up if I install nests or am I fine moving forward and using the C wire installation for the nests?


RemyLeBeau
LSU Fan
Member since Mar 2015
1564 posts

re: Smart Thermostat Argument with HVAC Tech
C wire is the Common for the 24 VAC power. I would think all of hers would have a C wire. I installed my Nest myself on a heat pump system and no issues.

When you go to install the Nest, you go online, or through the app and it asks some basic questions that leads you to a schematic you choose.

The only issue I had on start up was the switching valve wire to land on O or B. The fix was to change the setting on the Nest.

Good Luck


Maybe shoot for replacing one successfully before ordering all 3???


CAD703X
US Space Force Fan
Liberty Island
Member since Jul 2008
69472 posts

re: Smart Thermostat Argument with HVAC Tech
if its a business i wouldn't even consider nest because you don't know what types of configurations it might require that nest doesn't support.

just get this so you don't have to do it twice.

Image: https://digitalassets.resideo.com/damroot/RDEDesktop/10011/RTH8580WF-c1-6.jpg


MGreen5833
Alabama Fan
Muscle Shoals
Member since Aug 2018
29 posts

re: Smart Thermostat Argument with HVAC Tech
Had a new unit installed on a remodel in doing. Bought a nest and when I brought it to the installer he talked about all the problems he has seen with them. Recommended a Sensi for my system. Went with it and no problems so far.


Replies (0)
Replies (0)
50
LEASTBAY
LSU Fan
Member since Aug 2007
9842 posts

re: Smart Thermostat Argument with HVAC Tech
I had the same next for maybe 6 or 7 years. 3 different houses. Never a problem. Not compatible with my variable speed unit now but it was solid.


MGreen5833
Alabama Fan
Muscle Shoals
Member since Aug 2018
29 posts

re: Smart Thermostat Argument with HVAC Tech
I am still tempted to order a nest and try it with my setup. I would like to have the added features of the nest over the Sensi.


jmcwhrter
Member since Nov 2012
3996 posts

re: Smart Thermostat Argument with HVAC Tech
FYI if you have Entergy you can get Sensi thermostats for really cheap on their marketplace (also Ecobee, LED bulbs, surge protectors, etc.)

LINK /
This post was edited on 7/26 at 1:57 pm


LSUDbrous90
LSU Fan
Lafayette
Member since Dec 2011
1268 posts

re: Smart Thermostat Argument with HVAC Tech
quote:

if its a business i wouldn't even consider nest because you don't know what types of configurations it might require that nest doesn't support.


By business, its a converted warehouse that is a dance studio. Three separate units due to three large dance rooms so its not a big complicated business. Would this change your answer and what is the benefit of the one you linked over a nest?


LSUDbrous90
LSU Fan
Lafayette
Member since Dec 2011
1268 posts

re: Smart Thermostat Argument with HVAC Tech
quote:

C wire is the Common for the 24 VAC power. I would think all of hers would have a C wire. I installed my Nest myself on a heat pump system and no issues.


They all have C wires available at the thermostat although only 1 of the three current thermostats (just base level regular thermostats) use the C wire. Why would the HVAC guy recommend a sensi over the nest since all I can tell is that a sensi requires a C wire and a nest its optional?


junkfunky
LSU Fan
Member since Jan 2011
29569 posts

re: Smart Thermostat Argument with HVAC Tech
quote:

FYI if you have Entergy you can get Sensi thermostats for really cheap on their marketplace


Had no idea this existed. Thanks,


Replies (0)
Replies (0)
10
TD SponsorTD Fan
USA
Member since 2001
Thank you for supporting our sponsors
Advertisement
junkfunky
LSU Fan
Member since Jan 2011
29569 posts

re: Smart Thermostat Argument with HVAC Tech
quote:

nest its optional?


The nest does allow you to wire without the C but it uses a jumper and every issue I've heard of with Nest is because there is no C wire. It just doesn't work right for whatever reason.


Replies (0)
Replies (0)
10
CAD703X
US Space Force Fan
Liberty Island
Member since Jul 2008
69472 posts

re: Smart Thermostat Argument with HVAC Tech
quote:

By business, its a converted warehouse that is a dance studio. Three separate units due to three large dance rooms so its not a big complicated business. Would this change your answer and what is the benefit of the one you linked over a nest?


a. this unit is built like a tank..honeywell has put these in industrial settings for years even before they added the wifi component so you are getting something field tested for years that exists at 99% of buildings in this country.

b. better safe than sorry; i know the honeywell will work for what your mom needs. just install it and forget it. she can turn it remotely on her phone or even add the honeywell skill to alexa (if she has one) and use her voice to tell it to turn the units on. you can even create a routine in alexa so you issue one command and it does all 3 at the same time.

c. i dont think any of the whizbang nest features apply for what your mom needs and you can find those honeywells for $50ish all over amazon (at least that's what i paid like 10 years ago). many times contractors throw these up unused on amazon because they came bundled with the HVAC and the home owner wants a fancy nest or something instead.
This post was edited on 7/26 at 11:30 am


junkfunky
LSU Fan
Member since Jan 2011
29569 posts

re: Smart Thermostat Argument with HVAC Tech
quote:

you can even create a routine in alexa so you issue one command and it does all 3 at the same time.


They also have geofencing now so she might be able to set it up to automatically set the units when she leaves her house.


LSUDbrous90
LSU Fan
Lafayette
Member since Dec 2011
1268 posts

re: Smart Thermostat Argument with HVAC Tech
Sounds good. Will probably just go this route then.


Replies (0)
Replies (0)
00
CAD703X
US Space Force Fan
Liberty Island
Member since Jul 2008
69472 posts

re: Smart Thermostat Argument with HVAC Tech
quote:

They also have geofencing now so she might be able to set it up to automatically set the units when she leaves her house.


good call


TU Rob
Troy Fan
Birmingham
Member since Nov 2008
11862 posts

re: Smart Thermostat Argument with HVAC Tech
Another vote for Honeywell. You can control multiple thermostats in the app. The guy that installed mine showed me his at his house and at their beach place. So doing 3 in one building should be simple.


Replies (0)
Replies (0)
10
patnuh
LSU Fan
South LA
Member since Sep 2005
5369 posts
 Online 

re: Smart Thermostat Argument with HVAC Tech
I’ve used Nest in two houses over the last 6 years. No issues and I installed them myself.

AC sounds like my stepdad who won’t use an “ATM” card bc he had issues with that stuff back when they first came out.


SG_Geaux
LSU Fan
From Parts Unknown
Member since Aug 2004
71866 posts

re: Smart Thermostat Argument with HVAC Tech
Normally I laugh at CAD for pushing the Honeywell so hard, but I think he is 100% correct


Replies (0)
Replies (0)
50
LSUgEEkish
LSU Fan
Baton Rouge
Member since May 2013
49 posts

re: Smart Thermostat Argument with HVAC Tech
My A/C guy says exactly the same about the Nest. Said Ecobee is far and away better (along with honeywell). I went Ecobee and like the remote sensor options.


Replies (0)
Replies (0)
20
BruslyTiger
LSU Fan
Waiting on 420...
Member since Oct 2003
4039 posts

re: Smart Thermostat Argument with HVAC Tech
quote:

AC sounds like my stepdad who won’t use an “ATM” card bc he had issues with that stuff back when they first came out.

There is a forum for AC professionals and they all love the NEST because they get to go fix them after homeowners attempt to install themselves or burn up the units due to continuous restarts. Go research for yourself and don't take my word for it.

HVAC-Talk


first pageprev pagePage 1 of 2next pagelast page

Back to top

logoFollow TigerDroppings for LSU Football News
Follow us on Twitter, Facebook and Instagram to get the latest updates on LSU Football and Recruiting.

FacebookTwitterInstagram