When comparing Honeywell Lyric vs ecobee3, the Slant community recommends ecobee3 for most people. In the question“What are the best HomeKit thermostats?” ecobee3 is ranked 1st while Honeywell Lyric is ranked 3rd. The most important reason people chose ecobee3 is:
The display shows the current temperature, as well as which mode you're in (off, auto, cooling or heating), as well as humidity and the current weather. There is also a temperature slider handy for quick adjustments.
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Pros
Pro Can turn on/off automatically based on your location
The Lyric can turn on and off based on your location (or, more specifically, your phone's location). By default, this geo-fence is 7 miles, giving the thermostat enough time to get the back to a comfortable temperature. This can be changed, all the way down to 500 feet if you have a short commute.
Pro Futuristic design
It has a clean white front, with basic controls and large fonts. All the edges are trimmed with a stylish black, and the device produces an attractive glow behind it which helps make it stand out.
Pro Easy installation
The Lyric app provides step by step instructions, starting from removing your old thermostat all the way through until the end. There is just 1 small typo - the app says you don't need to connect the power wire (Rh) when indeed you do.
Pro Important information is displayed at a glance
The display shows the current temperature, as well as which mode you're in (off, auto, cooling or heating), as well as humidity and the current weather. There is also a temperature slider handy for quick adjustments.
Pro Satellite sensor provides extended sensing range
Instead of a single point of sensing which can be influenced based on its location, the ecobee3 also utilizes a satellite sensor. This satellite sensor provides another perspective on the house, and between the two will provide smarter heating and cooling.
For example, if the main thermostat is located near a heat source (kitchen, full living room, etc) or cold source (near a door in winter) it can be influenced by temporary temperature fluctuations. The satellite sensor can help detect these temporary changes, and won't over-heat (or over-cool) the house when it isn't actually required.
The range on this extra sensor is about 45 feet, which should be plenty for most houses.
Pro Full web support allows monitoring and adjusting from anywhere
In addition to the phone app, you can access the web portal for (almost) full control of the system. This is very handy if your phone's battery dies, as you can login from any internet connected device.
Pro Integrates with numerous other systems
In addition to HomeKit, the ecobee3 can hook up with IFTTT (IF This Then That - an automation tool based on custom recopies), Alexa (Amazon's voice activated personal assistant found in it's Echo line of products), Wink (a stand-alone ecosystem) as well as SmartThings (Samsung's smart home ecosystem). This allows integration with a wider variety of smart home products outside of the HomeKit ecosystem.
Pro Straightforward install for 5 wire systems
If you already have the common wire (ie your system uses 5 wires), the installation is very quick and easy.
Cons
Con Not compatible with all routers
Your router needs to have DHCP (Dynamic Host Configuration Protocol) otherwise this thermostat won't connect to your network.
Con Specific (more expensive) battery requirements
In order to provide longer battery life, the Lyric requires a AAA lithium battery - regular AAA batteries won't provide sufficient juice.
Con Buggy
The geo-fence feature can sometimes set the thermostat to 'away' while you're still in the house.
Notifications also don't always make it through, as sometimes all you get are generic looking error messages.
These bugs are likely to be fixed through future software updates, however currently they come as part of the product.
Con Installation can be tricky for 4 wire systems
If your system lacks the common (C) wire and is only a 4 wire system, you will need to use the included Power Extender Kit (5-wire systems don't require this). Then, additional steps are required depending if your HVAC system has a controller board or not.
Con Extra satellite sensors cost extra
One satellite sensor is included in the box, but if you want more you'll have to buy them. They come in packs of 2, and are sold at $79. It would also be convenient if you could buy just 1 additional sensor as well, but packs of 2 seem to be the only way they come.
Con The external sensor can lose connection
The satellite sensor is handy, but it adds another connection point which can disconnect (and based on user reviews, it can do so frequently even when installed within 5 meters of the main thermostat).