Know your system · Heating & cooling

Smart thermostats: why ecobee is the pick

Short version: ecobee is the pick, even if your home runs on Google. Its schedule is easier to set up and understand,¹ and it links to Google Home and the Google Assistant.² Nest has real strengths too, like working without a C wire in most homes.³ The pros and cons of each are below.

Why ecobee

ecobee and other brands both get installed in homes, and ecobee is the one to recommend. The reason is practical: its schedule is easier to explain.¹ When you know the schedule and which automatic settings are turned on, the thermostat is less likely to surprise you by changing the temperature on its own.¹ That holds in a home built around Google too, because ecobee plugs into Google Home.¹² This is a field opinion from service calls, not a lab test. Your house and habits matter more than any brand name.

ecobee vs Nest: the pros and cons

ecobee

What is good

• A schedule you can read at a glance: time blocks called Activities, each with its own temperatures, called Comfort Settings.⁴
• It does not rewrite your schedule on its own. Schedule Assistant emails suggested changes, and you do not have to accept them.⁵
• When an automatic feature is adjusting the temperature, the screen says "eco+ is on," and you can turn any eco+ feature off.⁶
• Room sensors: SmartSensors notice which rooms are in use and adjust the temperature for them, and they help it tell when everyone has left.⁷
• It works with the Google Assistant, Amazon Alexa, Apple Home and Samsung SmartThings.⁷
• A 3-year limited warranty.⁷

What to know

• It needs a C wire. If you do not have one, the Premium and Enhanced come with a Power Extender Kit that a pro installs at the furnace control board. The kit does not work with dual transformer or heat-only systems, and the Essential does not include one.⁸
• The automatic home-and-away features need an occupancy sensor. The Premium and Enhanced have one built in.⁷ The Essential needs a SmartSensor, sold separately.⁷
• A few extras, like listening for smoke alarms, need ecobee's Smart Security subscription.⁷

Nest

What is good

• It works without a C wire in most homes. Google says the Nest Learning Thermostat (4th gen) needs a C wire or its Power Connector in fewer than 1% of homes.³
• It is built for Google. Setup and control happen in the Google Home app, and the 4th gen is Matter-certified, so other Matter apps and voice assistants can control it too.³
• It learns for you. The older Learning Thermostats and the Thermostat E build a schedule from the changes you make.¹⁰ The 4th gen's Smart Schedule can apply changes itself or ask you first,¹¹ and the Nest Thermostat offers Savings Finder suggestions.¹²
• The 4th gen comes with a Nest Temperature Sensor in the box.³
• It switches to Eco Temperatures when nobody is home, and back when someone returns.¹³

What to know

• The schedule can change on its own. Auto-Schedule is on by default on the older Learning Thermostats and the Thermostat E, and two similar changes on back-to-back weekdays change the schedule for every weekday.¹⁰ On the 4th gen, Smart Schedule's Automatic setting applies changes for you unless you pick Suggestions.¹¹
• Features and menus differ by model and generation, so the steps for one Nest may not match another.¹²
• Older models lose support. The Nest Learning Thermostat 1st and 2nd gen stopped working in the Nest and Google Home apps on October 25, 2025, and no longer get software or security updates.¹⁴
• A shorter warranty: 2 years for the 4th gen bought at retail, and 1 year for the Nest Thermostat.³¹⁵
• Using a Nest with another company's app or voice assistant goes through Matter, which can need that company's hub.³

Whichever one you pick, know three things: your schedule, what a hold does, and which away or savings features are turned on. For what temperature to set, the thermostat settings guide asks five quick questions and gives you the numbers.

Already use Google Home? An ecobee still fits

ecobee links to Google. In the Google Home app, tap Add, then Set Up Device, then Works With Google, search for ecobee and sign in.² After that, you can ask Google for the temperature, set it, switch between "HEAT" and "COOL," turn the fan on and go back to the schedule.¹⁶ Paired SmartSensors work with the Google Assistant too.² You still set up the schedule and the eco+ features in the ecobee app or on the thermostat.⁴⁶

Have an older Nest? If it is a 1st or 2nd gen Learning Thermostat, it no longer works in Google's apps, so it is a good time to choose fresh.¹⁴

Which ecobee to get

All three current models use the same Activities and Comfort Settings schedule.⁴ The differences are the extras.

• Smart Thermostat Premium. The most features. A SmartSensor and an air quality monitor come with it, and you can have Siri or Alexa built in (Siri needs an Apple home hub).⁷ It has a built-in occupancy sensor⁷ and a Power Extender Kit in the box.⁸⁸
• Smart Thermostat Enhanced. Adjusts as you come and go with its built-in occupancy sensor.⁷⁹ A Power Extender Kit is in the box.⁸⁸
• Smart Thermostat Essential. The simple one, built around easy scheduling. Add a SmartSensor for the occupancy features.⁷ There is no Power Extender Kit in the box, so you need a C wire or a kit bought separately.⁸

How the ecobee schedule works

Start with the schedule, then check which automatic features are turned on. Its schedule is built from Activities (the time blocks in your day) and Comfort Settings (the heating and cooling temperatures and fan setting for each block). It ships with Home, Away and Sleep comfort settings, and you can create more in the app.⁴ You edit the schedule on the thermostat itself or in the ecobee app. Most ecobee thermostats use Main Menu > General > Schedule. Smart Thermostat Lite and Smart Thermostat Essential use Main Menu > Schedule. You can copy one day's schedule onto the rest of the week.⁴ Change the temperature by hand and the ecobee places a hold that overrides the schedule. The schedule itself cannot be removed, so if you would rather not use it, set the hold action to "Until I Change It."⁴

ecobee can automate too. On supported models, Smart Home & Away can override scheduled Home or Away periods using occupancy sensing. It is one of ecobee's eco+ features.⁹ If the temperature changes when you did not expect it, check for a hold and for eco+ features that are turned on. The schedule is not the only thing that can change it.

Wiring and power

A smart thermostat needs steady power.¹⁷ When the C (common) wire is connected, the R and C wires power the thermostat, so it does not need batteries.¹ You can look at the wall base for a wire on the C terminal, but leave the wires alone. Wire colors vary, so go by the letter.¹⁸ Not every house has a C wire at the thermostat, and some systems need one or a power adapter.¹⁷ When the wire run is short and easy, a pro can often replace the old thermostat wire with one that has more wires instead of adding an adapter. That is the more reliable fix, and the adapter is still a good, useful device. Either way, the wiring is a pro job.¹ Heat pumps add settings that have to match the equipment. One is the reversing valve setting: set wrong, a heat pump can cool in heat mode and heat in cool mode.¹⁹ That makes swapping or installing a thermostat a good job to hand to a pro.

Where to go from here

If your thermostat still changes the temperature on its own after you check the schedule, holds and automatic features, call a pro and tell them what you have already checked. That helps them find the problem faster.