These discounted smart thermostats don’t include color touchscreens or unique control mechanisms like those from Nest or Ecobee, but they both let you control them from an app, and the $99 model even works with Alexa.
- Emerson Sensi Wi-Fi Programmable Thermostat and Wall Plate Bundle | $99 | Home Depot
- Honeywell Wi-Fi Programmable Touchscreen Thermostat | $79 | Home Depot