Smart Thermostats let you monitor and control the temperature of your home with just the sound of your voice from anywhere in your home with your Alexa or outside your home from your phone. Our favorite model, the Ecobee, has sensors that automatically detect the room that you are in to heat our cool that room to the desired temperature. Our master bedroom is upstairs, and this feature has been awesome for us to keep the bedrooms cool in the summer and warm in the winter. We were also surprised how much energy savings we saw when we installed the Ecobee!