https://www.googlenestcommunity.com/t5/Nest-Thermostats/Google-Learning-Nest-Rc-or-Rh-and-24-volt-issue/m-p/632669#M122748 <P>my existing Google learning nest thermostat is connected with the following wires:&nbsp;</P><P>W1, C &amp; Rc, for a boiler-run radiant heat system.&nbsp; &nbsp;I noticed that the Rc is connected, but not the Rh. Why is that?&nbsp; &nbsp;I thought Rc is for cooling/AC only.</P><P>Also, do i have to turn off any power panel if i need to rewire or upgrade it,&nbsp; considering it's powered by a C wire ( 24 volt)? is it necessary to turn off the power , will i get a shock if I don't turn it off?</P><P>thank you</P> Mon, 22 Jul 2024 18:56:56 GMT KC2050 2024-07-22T18:56:56Z https://www.googlenestcommunity.com/t5/Nest-Thermostats/Google-Learning-Nest-Rc-or-Rh-and-24-volt-issue/m-p/632669#M122748 <P>my existing Google learning nest thermostat is connected with the following wires:&nbsp;</P><P>W1, C &amp; Rc, for a boiler-run radiant heat system.&nbsp; &nbsp;I noticed that the Rc is connected, but not the Rh. Why is that?&nbsp; &nbsp;I thought Rc is for cooling/AC only.</P><P>Also, do i have to turn off any power panel if i need to rewire or upgrade it,&nbsp; considering it's powered by a C wire ( 24 volt)? is it necessary to turn off the power , will i get a shock if I don't turn it off?</P><P>thank you</P> Mon, 22 Jul 2024 18:56:56 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/Google-Learning-Nest-Rc-or-Rh-and-24-volt-issue/m-p/632669#M122748 KC2050 2024-07-22T18:56:56Z