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ecobee - ecobee3 lite Smart Thermostat - Black

Ensure uncompromised comfort with this ecobee3 lite smart thermostat. Its DataRhythm technology provides intuitive temperature adjustment based on the current weather, family schedules, desired settings and information from room sensors for efficient operation. Control this Wi-Fi-enabled ecobee3 lite smart thermostat by voice or remotely from your Android or iOS device or Apple Watch.

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    What's Included

    • ecobee ecobee3 lite Smart Thermostat
    • ecobee3 lite backplate
    • Wire labels
    • Drywall plugs
    • Screws
    • Owner's manual

    Ratings & Reviews

    Overall Customer Rating:
    97% of customers would recommend this product to a friend (436 out of 452)

    Energy Ratings


    Wide-ranging compatibility

    Works with conventional (2H/2C), heat pump (4H/2C), gas, oil, electric and dual fuel.

    Works with ecobee room sensors

    Pair ecobee3 lite with ecobee room sensors to help manage hot and cold spots in your home, paying more attention to the rooms that matter most. (ecobee sensors sold separately)

    Compatible with Android and iOS devices

    Easily adjust temperature and comfort settings from anywhere using your Android or iOS devices, including Apple Watch.

    Connects to your existing home network

    Convenient Wi-Fi capabilities offer a secure and reliable connection.

    Makes your smart home even smarter

    ecobee3 lite integrates with your favourite platforms like Amazon Alexa, Apple HomeKit, Samsung SmartThings, IFTTT, and Wink.

    Smart comfort system

    Works with your local weather, schedule, and desired temperature settings ensuring comfort when you’re home, and savings when you’re not.

    3.5" color LCD touch screen

    Adjust the temperature from 45° to 92° and track humidity levels from 20% to 90% RH.

    Free monthly reports

    Allows you to see how much energy you've saved and tips on how you can save even more.

    Hardwired for reliability

    Means ecobee3 lite isn’t relying on a battery or your HVAC equipment to charge itself.

    Step-by-step guide

    For fast and easy installation.

    Alert system

    Sends you service alerts and reminders if ecobee3 lite senses your HVAC equipment is not working or is working sub-optimally.

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    Customer rating

    Rating 4.7 out of 5 stars with 452 reviews

    would recommend to a friend



    • Rating: 5 out of 5 stars

      Impressive smart thermostat so far!


      This is my personal review on the Ecobee3 Lite smart thermostat, which I got during a great promotion ran by Best Buy which included a free Echo Dot. I've had this thermostat for just about a month now and have been trying to learn most of its features since then. The first thing you must know is that this device requires a C-wire for power since it does not have a backup battery. This may be a challenge or a problem for a person who has little-to-none knowledge of how HVAC systems work as it will require the user to run an included adapter (Power Extender Kit) from your HVAC system which will eventually provide power to the Ecobee3 Lite thermostat. The instructions are very straight forward but again, if you do not feel comfortable opening your HVAC system and connecting the wires to the PEK, I would recommend to hire a licensed technician to do the work or buy a different smart thermostat that does not require a C-wire. Otherwise, the installation takes roughly half an hour (which is what it took me to complete with no prior experience of replacing/installing a thermostat). Out of the box, you get the thermostat, wire labels, a white backplate (in case you need to cover any holes from your previous thermostat), the Power Extender Kit (PEK, in case your thermostat does not have a C-wire), a backplate (to connect the wires), a couple of screws & wall anchors, and the installation manual. You will need a precision screw driver to remove wires from the old thermostat, a 3/16" drill bit, a phillips screw driver and a drill to facilitate the installation. If you do not have a cordless/corded drill, you can still get around with the installation but will take some additional time & effort. Remember to always follow safety procedures before working with electricity around your house to avoid serious injuries. Now onto the features I've tried so far. The Ecobee3 Lite supports a wide variety of third-party integrations such as Amazon Alexa, Apple Home Kit, Google Assistant to name a few. This gives a wide range of users to be able to control their smart thermostat with their voice, smart phone or automation. When you are initializing setting up the device, you are greeted with an Ecobee welcome message. You then have to give it a name, configure your Wireless network for communication, and most importantly, register your device. The device has three different comfort settings; Home, Away, and Sleep. These settings can be modified to your needs which can then be added to your weekly schedule with a specific time to run them. If there is one annoying thing I do not like so far is the fact that you cannot remove all comfort settings for a specific day from your weekly schedule. It must have at least one comfort setting to run unless you turn off the HVAC system from the thermostat. The thermostat by default comes with the "Smart Recovery" feature enabled, which Ecobee support said this feature allows your thermostat to understand your AC/heating pattern in how long it takes for your home to get to the desired temperature from your schedule. The thermostat takes into account the performance of the HVAC equipment relative to the effects of the inside temperature & predicts how long it will take to bring your home to a given temperature. This basically means that if you have your schedule set to "Away" mode from 8AM - 5PM (to be within a certain temperature range before it turns on your AC/heater), and then starting at 5PM you have it set to "Home" (again to be at a certain temperature range), it can still turn on your AC/heater during the "Away" mode in order to get to the desired temperature by the time you get home at 5PM, for instance. I do not like this "Smart Recovery" feature as the purpose of the "Away" schedule I set up is so that the A/C is never on while I'm not home. If you are like me, you can turn off this feature directly from the thermostat by going to Main Menu > Settings > Preferences > Heating/Cooling Smart Recovery. I also like the fact that their software is very similar across all platforms (mobile apps, website & thermostat screen), this makes it a lot easier to navigate around without having to learn it all over again when using a different device. You can also restrict access control to the thermostat by setting up a code in order to access the system. This is great if you have kids in the house or if using in a shared environment such as an office where only certain individuals may have access to change its settings without having to install a lock box on. The Ecobee3 Lite supports the proprietary room sensors, which can be added to different rooms and balance the temperature around your house. This is probably more suitable for two-story homes or bigger homes where temperature ranges drastically at certain times of the day. If you have a newer home with an open-floor plan, these sensors may not be very useful. Below is a summary of the Pros and Cons I have found out so far: Pros: - Compatible with Amazon Alexa and Apple's Home Kit & Google Assistant. - Uses geofencing to detect when you enter/exit a certain zone (configured by user) which will either trigger the thermostat to turn on or off. - Wireless connectivity compatible to 802.11 b/g/n @ 2.4GHz - 3-year warranty (that's two more years than the Nest) - Compatible with most HVAC systems (see Ecobee's website for additional info) - Schedule "Vacation" mode to overwrite your weekly schedule and keep HVAC system off if necessary. - Intuitive & seamless integration of their software across all platforms (smartphone app, online page, & thermostat's home screen) - Fast-response & bright touchscreen. - Access controls allows only those individuals with the configured code to change its settings. - Supports room sensors to add around the house and balance the temperature. - Useful data reports about your home's temperature & system information. - Can set reminders to change furnace filters & HVAC maintenance. - Great design. Cons: - Does not come with a backup battery, hence requiring a C-wire (this may be a problem for older homes). - Cannot create additional custom settings. - Cannot remove custom settings from weekly schedule. - Does not support dehumidifiers (this is more of a personal preference)

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Amazing Thermostat


      I got my Ecobee 3 Lite few weeks ago and I can't be happier with it. The installation process was seamless even on my four cable wiring, using the Power Extender Kit provided by Ecobee and the VERY clear instructions provided with the unit. The functionality provided is amazing. I’m using Geofencing on my iPhone (now also available for Android). Every time I leave the house, the Ecobee goes into Away mode and saves energy. Upon return, it goes back to schedule and keeps the house comfortable. It also has different threshold configuration settings like minimum external temperature to prevent your AC from triggering if it’s too cold outside, preventing damage to your AC unit. They also provide you with all the stats you need to check the efficiency of your home, check the threshold triggering your heating / AC. This lets you see the actual conditions triggering the system in order to let you make better decisions and adjust the setting accordingly. I would recommend the Ecobee 3 to anyone looking for a smart thermostat.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Nest is for the birds!


      The Ecobee3 Lite was a major upgrade for us from a basic digital thermostat. Its functionality allows us to adjust the temperature when we are out of the house, using a mobile app - came in very handy during the winters, knowing we could come home to a toasty warm house after we had activated the "away" settings as we left. We installed room sensors in our master bedroom and our basement, so the unit is able to adjust temperatures based on occupied areas of the house. The installation is fairly straight forward, although I had to use the PEK module due to the wiring in my house. Once I sent pics of my furnace wiring, customer service was able to talk me through the install, and it was clear sailing after that (depending on your wiring, you may need to have some wire nuts/marrettes on hand). One tip: before mounting your room sensors, place them in the area you would like to keep them for 36 hours, to ensure the signal is strong enough to maintain a connection - I mounted them right away, and later that night, the signal was lost, but reconnected a few hours later. I will need to move one sensor to another wall, but I look forward to utilizing the full functionality of the Ecobee 3 Lite. The Ecobee website offers detailed analysis of your furnace/air condition usage, and compares it to other users in your area.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Great addition to my "smart home"

      • Verified PurchaserVerified Purchase
      • My Best Buy® Elite MemberElite Member

      I bought this after my Honeywell non-smart thermostat was accidentally knocked off the wall & stopped booting up, though really that's just an excuse, since I've wanted this since seeing it at a friend's house. I was concerned about the install due to my house's lack of a C-wire, but the included connector for the HVAC's power panel was easy enough to install and helped provide more power to the wall port. For clarification, this plugs into the panel on your HVAC, likely your furnace, inside, and uses existing wiring there. It's like a dongle, just hangs off of the panel, but pushes power up to the unit via the cables already installed on your panel. I'm not an electrician so it's hard for me to explain, but it was easy enough to install! Anyway, once that part was done, the thermostat itself was easy to label & attach to the wall, and very easy to configure using my iPhone. I set it to its lowest setting: it's summer right now, and I have to set it to 65 for my upstairs to be comfortably 70 or so. I have ordered the extra sensors, so I can put them around the house (upstairs especially) to see if this helps the ecobee to run more efficiently once it sees that those rooms are sufficiently cooled as well. I love being able to access my thermostat from my Echo when home, or my iPhone when I'm out, so that if I'm out for longer than a few hours, I can up the thermostat to a higher temperature so my HVAC isn't running as much. So far, it's been a breeze to use & configure, and even keeps my house cooler than my previous thermostat. If you're looking for a smart solution, I'd definitely recommend this one for you.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Gives NEST a run for it's money

      • Verified PurchaserVerified Purchase
      • My Best Buy® Elite Plus MemberElite Plus Member

      I like this product. It's not smart like the NEST and you do need to program it but it's super easy. What I really like about this product is you can link sensors to it for each room so you're not just getting a reading where the thermostat is. This will monitor the temp in all the rooms where a sensor is installed and try to balance the overall temp. Installation was a bit of a pain but, I have to admit, I am not all that handy. I think for most it would be a piece of cake. Technical support for the product is okay (Yes, I had to call support to get it installed. I'm not proud) but I think it's offshore. The lady I talked to had a very thick accent which made her hard to understand though she was knowledgeable about the product. This product also paired up with Alexa super easy and works fine. I would stay away from the Ecobee 4. The built in Alexa does not have the same microphone technology as the real Alexa. The pick up is not as good nor can it judge when another Alexa is closer to your voice so if you have multiple Alexas and bring in an Ecobee 4 the Ecobee 4 may try to speak over the other Alexas. Just get a real Alexa and an Ecobee 3 lite.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Excellent Product - My 3rd purchase!

      • Verified PurchaserVerified Purchase

      This is the third Ecobee 3 I have installed in my homes - 2 Lites and 1 with sensors. The Lite version is the way to go. We have had little luck with the sensors and use that thermostat like a Lite. I installed this purchase on an oil fired, hot water baseboard system in our weekend house. Because the thermostats in this house only have two wires I needed to purchase a FastStat Common Maker to install at the furnace and at the thermostat. I followed the directions on the Ecobee support page. It took me about 30 minutes start to finish and the zone operates perfectly. Now we can set the heat up in the weekend house before we leave home and the house will be nice and toasty when we arrive. The thermostat shows up in the Ecobee App with our other two thermostats. When we leave at the end of the weekend, we just use the app to put the thermostat in away mode. Super easy. We can also monitor the temperature in the house using the app in case the heat stops working (provided power and internet stay on). I confirmed the Ecobee does not require an internet connection to function and will resume its program after a power outage. This was important for this application as the internet service here has poor reliability and power outages are common in the mountains. I tried this out by killing the power to the house and then turning it back on a few minutes later. The Ecobee reconnected and resumed its program. We love our Ecobees. It is rare to find a product that really lives up to its promise and the Ecobee delivers.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Best purchase

      • Verified PurchaserVerified Purchase
      • My Best Buy® MemberMember

      I love this thermostat for several different reasons. The first and most important is I gain control of the thermostat in my home while I am at work. My kids love to bump the air down that when I come home from work it is freezing in my house. I love controlling the air when I am not home. I also really like the thermostat display. It looks so much better and "techy" than my original thermostat. I love that it displays the temperature outside. Now, I am a single female and I have to call a handy-man for everything in my home. I have a brand new house that I installed this thermostat all by myself. So, yes it can be done. But don't believe the reviews that say it can be installed in 15 minutes. Maybe if you are an electrician, yes you can probably install it in 15 minutes. However, it took me several hours to install it. But it was well worth it. I eventually had to call Ecobee's customer service for help. Basically, the wiring that I set up was a little off I took a pic of and emailed to them. They looked at it and told me which wire I had in incorrectly. Now, there was also a second override that had to be completed as well before system would work. My suggestion for installation, call first and get help before spending too long on the installation if you can not get it up and running . Glad I purchased it. I really do love it.

      I would recommend this to a friend

    • Rating: 4 out of 5 stars

      Good thermostat, but I wish I got a Nest

      • Verified PurchaserVerified Purchase
      • My Best Buy® Elite Plus MemberElite Plus Member

      This thermostat works as advertised, but I think I prefer the Nest, as it is easier to adjust manually. The Ecobee does not have an intuitive way to adjust the target temperature from the actual device, whereas the Nest has a nice nob that you just turn and viola, it works. The nest gives you a range, and good luck making sense of how to adjust it. It is not instinctive at all. I hope they issue an update where I can type in a target number, or move a dial to a target number, but as it stands, it is not an intuitive system at all. Given that this is in my mothers house, and she is not a tech person, a traditional thermostat with up/down buttons would have likely been easier for her to use than the Ecobee. Again, it does function, and does allow Alexa to control it (but even that needs refinement, as Alexa requires you to remember what you called the each thermostat and does not give you and option to add multiple nicknames to a thermostat, making you always wonder "did I call name the thermostat Main floor, or main level, or first floor" when asking Alexa to adjust the the time you figure that out, you could have manually walked over to a Nest (or other manual thermostat) and adjusted it (the Ecobee will take another PhD to figure out how to set a target temperature - so don't even try to set it manually)

      No, I would not recommend this to a friend

    Product images, including color, may differ from actual product appearance.