Comments on: What is RH and RC on Thermostat? (Simple Answer!) https://thewiredshopper.com/rh-and-rc-on-a-thermostat/ Technology SIMPLIFIED For Your Every Day Life! Mon, 16 Jan 2023 19:49:36 +0000 hourly 1 https://wordpress.org/?v=6.5.8 By: Stephen Holland https://thewiredshopper.com/rh-and-rc-on-a-thermostat/#comment-25004040 Wed, 10 Nov 2021 05:36:11 +0000 https://thewiredshopper.com/?p=12517119#comment-25004040 There is an error in your discussion regarding the G fan wire. The fan turns on automatically when the furnace gets hot. The fan turns on automatically in the furnace during heating. During AC use the fan turns on requiring the G line.

Therefor you can use the G wire as s substitute for a common wire, but the g wire goes to common in the furnace and thermostat, and a jumper from Y to the furnace G terminal needs to be installed so the fan runs when the AC is triggered with the Y wire.

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