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Could a new thermostat fix this issue I’m having with nighttime cooling?

Posted on 5/11/23 at 9:42 am
Posted by StringedInstruments
Member since Oct 2013
18348 posts
Posted on 5/11/23 at 9:42 am
For some reason, my thermostat likes to think that as soon as it hits the temperature I’ve set, that its job is done.

So if I go to bed with it set at 71, it will cool until it hits 71 and then stay off for hours.

My house is not that well insulated, so it doesn’t take long for my room to heat up. Especially with body heat from me and my wife plus the dog. I’m losing a good deal of sleep in the summer months because I wake up warm and have to reset the thermostat.

Thing is, it doesn’t really matter what I set it to. If I bump it to 70 or 69, it runs to that temp and shuts off for a long, long time.

I could set it as low as 65 or something, but then it runs almost continuously. We have zone dampers installed, and it really blasts cold air when it’s running. It’s honestly almost too cold when it’s blowing. We don’t have a continuous high seer condenser to regulate the air speed/cooling power, so it’s full blast when it’s on.

Any tips for this? Maybe a way to move the thermostat or some kind of thermometer into my bedroom?
Posted by AlxTgr
Kyre Banorg
Member since Oct 2003
81604 posts
Posted on 5/11/23 at 9:52 am to
quote:

it will cool until it hits 71 and then stay off for hours.
If it gets much warmer than this, it should come back on. Have you checked to see what temp triggers this?
Posted by idlewatcher
County Jail
Member since Jan 2012
78949 posts
Posted on 5/11/23 at 9:53 am to
quote:

Any tips for this?


Your thermostat placement is probably off. The area which it resides is probably in an area that retains cooled air for longer vs say your bedroom.

Just FYI, it's pretty easy (if you're handy) to move the thermostat and restring your low voltage line.
Posted by Ziggy
Member since Oct 2007
21509 posts
Posted on 5/11/23 at 9:59 am to
quote:

Your thermostat placement is probably off. The area which it resides is probably in an area that retains cooled air for longer vs say your bedroom.

Also, is your thermostat near the return air grille?
Posted by Weekend Warrior79
Member since Aug 2014
16328 posts
Posted on 5/11/23 at 10:02 am to
Easiest solution would be to adjust the programming. I have a similar situation with my room, but I can't drop the temp too low because I'd freeze out my kids. I already have my thermostat to drop to 72 at 9:30 to get the house nice a cool before I go to bed. Then at 2am it drops to 70 to make sure that it kicks on and runs in the middle of the night when things could get stagnate.

Next easiest would be to move the location as others suggested
Posted by corndawg85
MS
Member since Oct 2013
832 posts
Posted on 5/11/23 at 10:04 am to
I know Ecobee has a sensor, I'm sure the other smart brands do as well, and at a certain time you can tell your thermostat to use the sensor as the official thermostat. For example, you set your thermostat to cool the house to 70, but that sensor in your room is reading 71 then it will tell the AC not to cut off until that room is 70 degrees. I've had times with mine when it was trying to get a room to 70 but the rest of the house was at 68 degrees.
Posted by BilbeauTBaggins
probably stuck in traffic
Member since May 2021
4308 posts
Posted on 5/11/23 at 10:05 am to
Your thermostat is going to regulate the temperature based on where it's placed in a house. I know with Nest, they offer temperature sensors that you can place in rooms so that Nest will run until it cools that specific thermostat.

quote:

body heat from me and my wife plus the dog


Might suggest getting a mattress that regulates body heat better, along with sheets. We upgraded to a Purple mattress and got bamboo sheets. There was an immediate difference in sleeping temperatures.

quote:

My house is not that well insulated


Consider fixing this before it becomes steady 90 degree days for the next three months.
Posted by mdomingue
Lafayette, LA
Member since Nov 2010
30107 posts
Posted on 5/11/23 at 10:09 am to
I have a nest and I also got 3 of the remote sensors. That way I can run the based on the temp in the room we are in. At night I can set it in my bedroom, screw them kids they're adults now anyway
Posted by CrawDude
Baton Rouge
Member since Apr 2019
5264 posts
Posted on 5/11/23 at 10:44 am to
Thermostats have an temperature off-set, usually adjustable, of a couple degrees or so on either side of the set point, before the unit turns off or on. It prevents rapid off-on cycling of the unit. Look up your thermostat model number see if there is an operational manual and read he manual to see if it is adjustable.

Is this a digital or analog thernostat?

Might be time for an thermostat upgrade?
Posted by lsujro
north of the wall
Member since Jul 2007
3919 posts
Posted on 5/11/23 at 10:46 am to
quote:

I know Ecobee has a sensor, I'm sure the other smart brands do as well, and at a certain time you can tell your thermostat to use the sensor as the official thermostat. For example, you set your thermostat to cool the house to 70, but that sensor in your room is reading 71 then it will tell the AC not to cut off until that room is 70 degrees. I've had times with mine when it was trying to get a room to 70 but the rest of the house was at 68 degrees.


I have ecobee for this reason. At night, my room is the primary thermostat. You can have it change stat points at different times of day as needed (they will average if you use multiple). My kids rooms are freezing at night, but I'm comfy
Posted by notsince98
KC, MO
Member since Oct 2012
17954 posts
Posted on 5/11/23 at 10:57 am to
verify temperatures at the t-stat location. Sounds like it might be an issue where T-stat is not in the room you are sleeping in.
Posted by eatpie
Kentucky
Member since Aug 2018
1121 posts
Posted on 5/11/23 at 1:07 pm to
If you have an old thermostat, it could be simply coated in dust and "insulating" itself. Before anything else, I'd remove the cover and check. If it is dirty enough to be a problem, it will be obvious.
Posted by StringedInstruments
Member since Oct 2013
18348 posts
Posted on 5/11/23 at 1:27 pm to
quote:

Also, is your thermostat near the return air grille?


Yep. About three feet from it.
Posted by StringedInstruments
Member since Oct 2013
18348 posts
Posted on 5/11/23 at 1:31 pm to
Sounds like the Ecobee is what I need. My son is hot too and his room shares the zone with ours, so he’d probably appreciate more cooling.
Posted by Simon Gruber
Member since Mar 2017
833 posts
Posted on 5/11/23 at 2:13 pm to
I have 2 nest thermostats and 4 room sensors. I definitely recommend the sensors.

We have 2 sensors in the living and kitchen area to control the 2 units during the day and afternoon then at night it switches to the 2 bedroom sensors to get bedrooms to desired temperature before going to bed. It’s amazingly more comfortable and efficient than just running off the 2 thermostats located in hallways on each side of the house.
Posted by SERVON225LLT
Baton Rouge, LA
Member since Jun 2010
275 posts
Posted on 5/11/23 at 3:48 pm to
+1 for ecobee. I have two systems and a remote sensor on each. One is for my bedroom to keep it cozy during sleep.

The other is on the unit that serves the kid’s bedrooms and I put it in the room that tended to be more extreme in temperature based on seasons.
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