THERMOSTAT definition in American English

Thermostat - Wikipedia

Traditional Thermostats

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HVAC Thermostats – Programmable Temperature Controls

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Question: How do I interpret these black and red lines? The previous home owner said it is for the A/C. I tried / am trying to put in my Google nest thermostat

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Honeywell Home YTHX9421R5085WW/U Prestige IAQ Thermostat with RedLINK and EIM