These thermostats, which range from the barebones and simple to the smart and colorful, are up to 40% off. All thermostats are not created equal. That's because you and I probably don't handle our home heating and cooling the same way. You may prefer a smart thermostat that can automatically adjust the temperature to save you money, that can respond to voice commands or that you can control from your phone . Or you may want one with three simple buttons on the wall. That full
