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Blue "C" wire is connected to "Y" on old thermostat. New thermostat has separate "C" hookup. Where does the blue wire go - "Y" or "C"? : r/Nest
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Heagstat 5-1-1 Day Programmable Thermostat for Home, up to 2 Heat/ 2 Cool, DIY Install - C-Wire Not Required - Amazon.com
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Heagstat Non Programmable Thermostats for Home 1 Heat/ 1 Cool, DIY Instal, C-Wire Not Required. - Amazon.com
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