Most popular brands of smart thermostats allow you to control the thermostat through an app you can install on a tablet or smartphone, allowing for complete control at your fingertips. For example, Honeywell WiFi Thermostats can be controlled via the Honeywell Total Connect Comfort app, and Ecobee smart thermostats work seamlessly with Apple HomeKit on all iOS devices including the Apple Watch, and leading smart home ecosystems including the Google Assistant.