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A/C Question About Temp Settings & Energy Usage

Posted on 8/20/25 at 11:53 pm
Posted by Craw Dawg
Member since Jan 2023
743 posts
Posted on 8/20/25 at 11:53 pm
Could someone explain to me how setting my unit on 71 appears to be using more electricity than having it set on 70? The "swing" is on .3 for both.

On 71, I'm using 50 k.w. in 24 hours. On 70, I'm using 40 k.w. in 24 hours.

The run times seem to be odd as well. Today, at one point, it ran for an hour & a half straight, then shut off for 15-20 mins., set on 71. When it is set on 70, I get consistent 20-40 mins. on & 10-20 mins. off cycles...

Any feedback would be greatly appreciated. Thanks.
This post was edited on 8/21/25 at 12:21 am
Posted by Tangineck
Mandeville
Member since Nov 2017
2698 posts
Posted on 8/21/25 at 5:23 am to
Are you taking time of day, temperature and humidity outside into account?
This post was edited on 8/21/25 at 5:24 am
Posted by LSUtigerME
Walker, LA
Member since Oct 2012
3929 posts
Posted on 8/21/25 at 7:33 am to
You have different heat loads across those days.

The only factor to your energy usage (assuming single stage) is the run time. There’s no black magic happening.

If you have a 2-stage or variable unit, that introduces some variables in how the unit will respond.
Posted by notsince98
KC, MO
Member since Oct 2012
21268 posts
Posted on 8/21/25 at 8:10 am to
you need to have exact same outside temperatures for all hours of the day AND you need all internal home activity (laundry, dishes, etc.) to be at the same level and at the same times to get comparable data.
Posted by Turnblad85
Member since Sep 2022
4261 posts
Posted on 8/21/25 at 8:16 am to
quote:

Could someone explain to me how setting my unit on 71 appears to be using more electricity than having it set on 70?



Sure.


Your accounting of KWH is incorrect.



---'Blad
Posted by trident
Member since Jul 2007
4841 posts
Posted on 8/21/25 at 10:14 am to
it will just be the amp needed to start the compressor that will change. Lower temp will result in more starts
Posted by OysterPoBoy
City of St. George
Member since Jul 2013
42644 posts
Posted on 8/21/25 at 10:29 am to
It's similar to how going faster on the interstate increases fuel mileage. Once the unit is up and running it takes more energy to stop it and start it back up. We keep ours steady at 68.
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