What's the go-to wifi connected thermostat these days?

No negative with my nest. Love it.

I have had Ecobee at my old house and bought a new one when I moved into my new house. If you have an older home without a C-wire the ecobee comes with a relay you can hookup yourself so you don't have to run a wire from your unit to the thermostat. I also like the sensor that comes with the ecobee. If you are in your bedroom the sensor will notice and make sure to run the AC/Heat to get your bedroom to whatever temp you set on the main unit. Most old thermostats only get the temp to whatever is set at the main unit regardless of what temp your room is currently at.

Got 2 nest 3rd gen . They just released a 129.00 version that looks pretty stylish.

Nest has sensors as well. You can put them in additional rooms and use that specific temp to dictate what you want your unit to do. We use the sensor in our bedroom to control night settings.

Honeywell has sensors too. Just moved and installed homeywell units on our 3 units. Like them so far. Had Ecobee at the old place. Honeywell is simpler and has a potential easier WAF.

Handful of things to consider

1) function. These are replacing $20 pieces of equipment that are about as simple as you can get. Their performance is well above standard thermostats
2)app environment. Just make sure that if you use Alexa, Google, or Siri that what you want is supported. You’ll probably use an app to set a schedule and tweak it for a month or two and never touch it again. Most of them will learn just by your tweaking of the thermostat itself and not even really require the app
3) peripheral sensors. Is a room you often use too hot/cold? You want to grab this and tune the thermostat to that room.
4) aesthetics. This is actually probably the #1 reason to go with one brand over another. Like a large touchscreen that looks super modern? Honeywell makes some attractive models. Have a neutral colored drywall and want something to blend in? The Nest E is very dull looking against it.
But also: what was there before? Something with two large screw holes that will need to be filled? Will a backplate look attractive or be unpreferred?
I think Nest makes the most finishes and actually has a market for 3rd party back plates that match, if this is desired.
Performance seems to be so similar that most of the rest doesn’t really matter unless the Mrs likes it. So I have Nest with the black finish in one room, and the “E” model in my two other rooms with thermostats. They work great. They integrate with my Logitech Harmony remote and app. They can be controlled by Lutron.
My father, on the other hand, has an Ecobee with Alexa built in and loves that. It works fine
Father in law has one of the Honeywell models and has zero complaints as well.

quote:

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What I have, I stay away from Google products. Think the Nest products are better, but the Ecobee devices are still very nice and not Google.

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This.

Nest and Ecobee are neck and neck. One is not Google.

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i have 2 HVAC systems (both my old & new house)

i pulled my old school honeywell wifi units when i moved and replaced the mercury-units at the new house with them.

a couple years ago i updated these to honeywell T5s not because they were having problems but because there was a sale at amazon and i liked the way they looked.

the nice thing about honeywell (and i'm sure others do the same thing) is i get detailed email reports every month showing energy usage, comparison to last year, average temp for the months, etc. i love those reports so i'm kinda tied into honeywell now since i like the historic data.

eta i don't have any google smart devices in my house. i control these via alexa dots for the most part if i need to change the temp outside of my normal triggers and schedules.