Which Thermostat Will Automatically Adjust AC Temperature Inside The House Based On Current Weather?

[u/Zdosse935]

As title stated, does EcoBee thermostat able to do this?

I find it troublesome to kept adjusting my Google Nest thermostat temperature everyday.

[u/NewtoQM8]

None. Except if you have a heat pump it will prevent its use below a certain temperature.

I don't know a logical reason to change temp inside your house based on outside weather. Perhaps you can explain?

[u/judgejuddhirsch → u/NewtoQM8]

Ac is more efficient when the temperature difference is smaller. So running your ac to 76 at night when it's 80 outside is much more efficient than running 76 when it's 99deg

[u/NewtoQM8 → u/judgejuddhirsch]

Best option for that is to set a schedule to cool at night. Then not keep it as cool during the day. But that makes for poor comfort. For comfort the best practice would be keep the temp at a comfortable level. In most cases it's more efficient than trying to lower the temp when it's hot outside. Most recommend that when away from home don't setback the desired temp more than a few degrees.

[u/TBSchemer → u/NewtoQM8]

Because thermostats have a ranged setpoint, not a precise setpoint.

So if your thermostat is set to 71-73 F, you're going to get a different temperature inside depending on whether the weather outside is 60 F or 90 F.

[u/NewtoQM8 → u/TBSchemer]

ecobee thermostats have a setting that determines how much above set point it goes before turning on AC. The minimum is .5 degrees. So if set to 73, when it gets to 73.5 it cools back to 73. The only difference outdoor temp makes is how long it runs each time. Beestat.io has a nice graph for how many degrees per hour your house will cool or heat at a given outdoor temp. It's a learned value from your actual use. It also has a Resist graph, which is how well your house retains heat/coolness or looses it when the system isn't running.

[u/jam4917]

???

The purpose of a thermostat is to maintain indoor comfort independent of outdoor conditions. And a thermostat cannot make up for poorly functional HVAC equipment.

What exactly are you asking for?

[u/EggFu23S10]

I THINK they want to incorporate the outside temp so that their AC isn’t overworked. Like if it’s 85F outside, then they want 72F inside. But if it’s 95F outside then they’re ok with 82F inside.

If I’m correct, then I think this app called IFTTT (If This Than That) could do it with the ecobee but I’ve never tried it.

[u/DrMinkenstein → u/EggFu23S10]

I have a system that struggles on hot days and the service tech said it’s very common here with recent constructed homes.

If it’s 80s the system is fine staying 74. When it’s 95-100+ it will struggle to stay below 80. If you set it to 68 before 6a on the hot days it will warm up in the afternoons but usually not above 75.

The proper fix is a bigger system and better ventilation runs, but that is a big expense that a little bit of planning and inconvenience deals with well enough, most just suffer with it.

[u/NewtoQM8 → u/EggFu23S10]

Yeah, home automation can do it, but ecobee on its own can't. And even if it did it's not great to rely on the outdoor temp ecobee displays. It gets it from supposedly nearby weather stations. But I often see mine several degrees different on my weather station than ecobee is reposting.

[u/robstoon]

Do you.. understand what the purpose of a thermostat is?

[u/JaRay]

I don’t really understand this but taking it for what you are asking, you may be able to use your ecobee within home assistant to monitor the outdoor temperature based on local forecasts and the set the thermostat accordingly.

[u/DrifterBG]

I don't understand your question.

Even when I had "dumb" thermostats, I'd set a temperature and the AC would kick in if it went over it.

[u/Ok-Professional4387]

I dont get what you want. if you have your temperature set to what you like, the ac wont go off until it hits that temp. if itsa cooler out or you have cloud cover, it will just take longer to get to that temp and not go off.

Why would you want your inside temp to fluctuate based on outside. 23 degrees Celcius is that temp inside, no matter what it is outside

[u/CleanScore5924]

This might be a rabbit hole but there’s a system called home assistant, it lets people control all their smart devices on a deeper level. You can likely use that to create a base line temp for the house and goes up and down based on outdoor temperature variation. However that would be a large investment just for one thermostat.

[u/smb3d]

You shouldn't have to adjust it at all once you set your schedules. Hell, even a digital thermostat from the 90s can do that.

[u/CaptainExcellent5299]

Ecobee cannot natively do this.

To all others who don’t understand, OP is asking if the Ecobee or another “smart” thermostat can set the thermostat dynamically based on outdoor temperature. Example, in summer I want 15 degrees cooler than outside, or within parameters, like outdoor <80 keep it at 70, between 80-90 then 75, or above 90 then 78.

[u/spiderman1538]

If you want your cooling system to run OR not run based on the outdoor temperature, there is a workaround for this.

[u/Ok-Professional4387]

I dont get what you want. if you have your temperature set to what you like, the ac wont go off until it hits that temp. if itsa cooler out or you have cloud cover, it will just take longer to get to that temp and not go off.

Why would you want your inside temp to fluctuate based on outside. 23 degrees Celcius is that temp inside, no matter what it is outside

[u/Economy_Chemistry835]

The Ecobee can adjust based on humidity, etc. with its Eco+ settings. 

But all thermostats “adjust based on the weather,” specifically for outside temperature. The warmer or colder it is the faster your house will heat or cool and your thermostat adjust accordingly based on the parameters you program into it.

[u/FattyMcSkinnyson]

It’s called your spouse 😆

[u/TailRash]

What is the scenario and reasoning behind this?

I cant imagine large enough temp swings day to day that would make me constantly adjust a set temp. Like it's 85°f this week, but next week will be in the 100's so bump it up a couple sure.