Amazon's Alexa has a pretty big advantage over the Google Assistant, and that is the integration it has with smart home appliances, including thermostats. While many of the smart thermostats out there are already compatible with Amazon Alexa, some aren't, so we rounded up the best ones that are compatible with Alexa, so you can just tell Alexa to control the temperature in your home.
Sensi Smart Thermostat
The Sensi Smart Thermostat is definitely not the most impressive looking thermostat out there, but it does work well. It is compatible with Alexa, so you can tell Alexa to change the temperature. It also works with an app made for iOS and Android, allowing you to control your home's temperature from outside of your home. Which can be pretty useful.
Ecobee3 Lite Thermostat
The Ecobee3 thermostats are probably the stealthiest looking smart thermostats available. This is the "lite" model, which means it is a bit cheaper, and also has less features. But Ecobee3 does not that you will still save around 23% on heating and cooling costs by using the Ecobee3 Lite, which is a good enough reason to buy one.
Nest Learning Thermostat
Probably the most popular smart thermostat is the Nest. It's a great thermostat and this here is their third generation model. It works with both Alexa and the Google Assistant, and you can schedule it to change the temperature at certain times of day. Like the Ecobee3, it will also save you a boatload on heating and cooling costs, which is definitely worth buying for that alone.
Lyric Round 2.0 Wi-Fi Smart Programmable Thermostat
Lyric is likely a name you haven't heard of before in the smart thermostat world, but they offer a great model in the Round 2.0. They note that this is compatible with not only Amazon Alexa, but also Apple's Homekit and IFTTT. Which means you can create recipes to change the temperature in your home. Say for instance if the temperature outside goes above 80 degrees, you can have it automatically turn on the air conditioning, even if you aren't home.
Ecobee4 Alexa-Enabled Thermostat with Sensor
This is the latest smart thermostat from Ecobee. It actually is still up for pre-order as of this writing. It costs $249, and is a bit more energy efficient than the Ecobee3, as well as more compact. Of course, it does work with Amazon Alexa, Apple HomeKit, Samsung SmartThings and IFTTT for integration.
Rounding out our list, we have a thermostat from iDevices which works pretty well. It does support both Alexa and Siri's Homekit, but not Google Assistant. There's no plans for Google Assistant just yet. But you can still grab the Echo Dot and have Alexa in your home for just $50 and control your thermostat with your voice.