Smart thermostats learn your routine and automatically raise the temperature when you’re away and cool things down before you return, avoiding unnecessary energy use. You can also adjust settings remotely from your phone, so you’re never cooling an empty house.

Setting your thermostat a few degrees higher while you’re away or asleep can lead to significant savings. Many smart thermostats provide reports and tips, helping you fine-tune your energy use and stay cool while keeping your electric bill in check.