If you're Ecobee and you have to compete against an Alphabet-backed heavyweight like Nest in the smart home space, what do you do? Simple: add built-in voice control that Nest can't currently match. The new Ecobee4 thermostat incorporates Amazon's Alexa. That gives you hands-off control over your home's climate, of course (such as saying when you're away), but it also turns your thermostat into a sort of wall-mounted Echo -- you can use just about any Alexa skill that makes sense. If you want to set a reminder or fetch a recipe, you might not need a separate device.