As energy prices climb, the high-tech smart thermostat takes center stage as a must-have upgrade: It can save you hundreds.

The affordable Ecobee Smart Thermostat Essential supports app and voice control, works with most home automation platforms, ...

That's a far cry from eyeballing old dials and levers on thermostats from decades past. The end result: A mild-mannered smart device from brands like Ecobee, Google Nest, Honeywell Home and Amazon ...