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Emerson Sensi 7-day Programmable Wi-Fi Smart Thermostat, No C-Wire Required for Most Systems ST55 - The Home Depot
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DIY Smart thermostat using node-red. Can control smart lights and view multiple cameras around the house. All for about $175 : r/raspberry_pi
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SASWELL Alpha Smart Thermostat with Voice Control, Connected Control Smart Phone Wi-Fi Thermostat, Touchscreen Color Display, DIY, Built-in Alexa. T18UTW-7-WIFI. - Amazon.com
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Certified Refurbished Amazon Smart Thermostat ENERGY STAR certified, DIY install, Works with Alexa C-wire required Thermostat only
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Vine Smart Thermostat for Home TJ-560, WiFi Programmable Thermostat, Compatible with Alexa and Google Assistant, Energy Saving, 4 Inches Touch Screen, C-Wire Required, DIY Installation, Green - Amazon.com
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