Perhaps the most popular product in the Smart Home category is smart thermostats, and that makes plenty of sense. Being able to automate the temperature in your home, or control it from your smartphone is a big deal, and actually it'll save you plenty of money as well. Since you aren't keeping your thermostat at a set 70 degrees all the time, the thermostat instead keeps your home at 70 degrees, so that once it hits that temperature, it'll adjust to stay there. Which in turn lowers energy consumption and costs.
Most thermostats are over $100 (we have a few listed below), which is a bit expensive for a thermostat, but it will more than pay for itself in a year or so. The amount you save actually all depends on where you live, the climate you live in, the settings you set for that thermostat and much more. But for most people, the smart thermostat will pay for itself within a year. And if you're looking to be a bit "greener" then a smart thermostat is also the way to go. Since it'll use less energy than a traditional thermostat, since it does automatically adjust itself when the temperature in the room hits the desired temperature.
Saving some money and saving energy is not the only reason for buying a smart thermostat, in fact, many people buy it for other reasons. For example, the fact that you can adjust the temperature in your home when you aren't home. This is a great feature to have, since you can leave your home nice and warm during the day, and then turn on the air conditioning when you're on your way home and have it nice and comfortable when you get back from work. Saving that energy that the air conditioning would have used during the day, but also adjusting the temperature based on how warm or cold it is outside. With these smart thermostats, you also have the ability to set timers, so the air conditioning will have a higher temperature at night and a lower one during the day. Since it's typically cooler at night, you don't need as much cold air coming in. So this way you can set your thermostat and forget about it.
Many thermostats these days do also work with personal assistants like Amazon Alexa and Google Assistant. The Nest Thermostat is a good example here. Using either Alexa or Google Assistant, you'll be able to turn down the heat. By saying something like, "Alexa, Ask Nest to set temperature to 72 degrees". Which is a pretty cool feature to have, especially if you don't want to walk over to the thermostat (or perhaps you are disabled and it's much more of a chore to get there than it would be for a younger person). Of course there is also the ecobee4 thermostat which actually has Alexa built-in, like an Echo. So you can ask your thermostat to put things on your shopping list, order things from Amazon and much more. That may be a bit overboard but still a cool feature.