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I just installed one of those smart thermostats. Quick question for anyone who owns one

Posted on 10/11/21 at 12:49 am
Posted by nateslu1
Mr. Belvedere Fan Club
Member since Apr 2012
6441 posts
Posted on 10/11/21 at 12:49 am
So my electric bill has sky rocketed lately, as most everyone's has probably. I found a good deal on a nest 3rd gen learning thermostat on amazon so I decided to try it out.

After successfully installing it, about three hours later I went to check the app and it is reading 51% humidity. I didn't even know it measured humidity but now I'm worried because I read that anything over 50% is not good.

Anyone have any experience with this at all?

TIA
Posted by Tiger022
Bozeman, Montana
Member since Jan 2010
455 posts
Posted on 10/11/21 at 1:12 am to
51% isn’t terrible. If it bothers you, you can buy a dehumidifier from Sam’s, Costco, or Amazon.
Posted by mtcheral
BR
Member since Oct 2008
1948 posts
Posted on 10/11/21 at 1:22 am to
That’s fine. Mine stays around 60%.
Posted by bigbuckchuck
Member since Oct 2020
42 posts
Posted on 10/11/21 at 6:02 am to
yea 51% isn't bad at all in south louisiana. i just built a house and my builder installed one at my house and it was around 60%. i was worried, but builder said that's normal lol
Posted by PurpleGoldTiger
Thibodaux, LA
Member since Mar 2010
4009 posts
Posted on 10/11/21 at 8:03 am to
My previous home had a Nest thermostat and I found that the humidity reading on it was always off by at least a few % points.

51% is not bad at all, but I would verify that humidity reading before buying anything to remedy the situation.
Posted by TheBoo
South to Louisiana
Member since Aug 2012
4550 posts
Posted on 10/11/21 at 8:17 am to
Mine varies between 49% and 52%. Considering our outdoor humidity is typically 97% that's pretty good.
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5285 posts
Posted on 10/11/21 at 9:21 am to
51% humidity is fine - a properly sized and operating HVAC is designed to maintain near 50% relative humidity at peak heat loads, afternoon/summer, if the outside relative humidity is high. Of course during fall and spring, rainy days, or evenings when the heat load on the house is less and the HVAC is not operating expect relative humidity to increase somewhat if humidity outside is high.

Many home humidity meters only have an accuracy of plus or minus 3%. Usually constant humidity exceeding 60% is where concern creeps in regards to mold and health issues and you you need to start doing some investigating. LINK

Also not to rain on your parade, but be aware that according HVAC technicians Nest thermostats have a reputation of being problematic, some leading to expensive HVAC repairs LINK so if by chance you start having HVAC issues down the road don’t completely discount the thermostat as a potential source of the issue.

This post was edited on 10/11/21 at 10:55 am
Posted by GeauxldMember
Member since Nov 2003
4405 posts
Posted on 10/11/21 at 3:33 pm to
quote:

My previous home had a Nest thermostat and I found that the humidity reading on it was always off by at least a few % points.


Mine is pretty spot on. I’ve got a whole home DH set to 45% and the Nest is consistently right at 45%…unless someone takes a hot shower in the guest bath right next to the thermostat, then it reads >60% for a bit.

But yeah, OP, if your system is consistently maintaining 51% RH in south LA, that’s pretty good.
Posted by DiamondDog
Louisiana
Member since Nov 2019
10619 posts
Posted on 10/11/21 at 4:48 pm to
Ours is 51%. Glad that's another thing I don't have to worry about
Posted by modes
Member since May 2017
258 posts
Posted on 10/11/21 at 4:58 pm to
I've got an old leaky house and mine yells at me when it hit 70% humidity during the summer afternoons. But usually sits in the low 60%'s
Posted by GeauxldMember
Member since Nov 2003
4405 posts
Posted on 10/11/21 at 6:14 pm to
quote:

when it hit 70% humidity during the summer afternoons.


Gives me swamp arse just reading it…
Posted by tilco
Spanish Fort, AL
Member since Nov 2013
13498 posts
Posted on 10/11/21 at 7:31 pm to
Most of them will allow you to adjust it. Mine was way off when I installed it. Spent a couple days with a hygrometer and adjusted it down. It was consistently reading 7-8% higher than it actually was.
Posted by AndyCBR
Baton Rouge, LA
Member since Nov 2012
7564 posts
Posted on 10/11/21 at 9:17 pm to
If you can hit 51% RH in South LA that is very good.

You would have to have an extremely tight house and a whole house dehumidifier to do much better than that.

I would say the benchmark in South LA would be if the system cannot maintain anything less than 60% or so it is likely oversized or short cycling for some other reason.
Posted by bapple
Capital City
Member since Oct 2010
11914 posts
Posted on 10/12/21 at 10:59 am to
quote:

Spent a couple days with a hygrometer and adjusted it down


My Honeywell thermostat in my kitchen is about 5.5 years old and I was wondering why it was reading consistently 55-70% humidity a lot this summer. Bought a portable hygrometer and realized the thermostat was off by about 10%.

Don’t always trust the reading on a thermostat because humidity is not its main function. Get a portable meter and let it sit in one spot for a few days to see what the humidity really is.
This post was edited on 10/12/21 at 11:00 am
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