Amazon is offering the ecobee3 lite Wi-Fi Thermostat for $139.92 with free shipping. This smart thermostat generally sells for closer to $170 (its full retail price), which makes this deal a must-buy if you've been eyeing this highly-rated smart thermostat. Being HomeKit-compatible, you'll be able to use Siri commands to adjust the settings, change the temperature, and more.

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Smart thermostats can help save "an average of 23% annually on your heating and cooling bill", which means that over time the investment will pay for itself.

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