![Advice on how to wire a 4 wire RGWY wifi thermostat to an old hvac with no c wire? - Home Improvement Stack Exchange Advice on how to wire a 4 wire RGWY wifi thermostat to an old hvac with no c wire? - Home Improvement Stack Exchange](https://i.stack.imgur.com/j5dG1.jpg)
Advice on how to wire a 4 wire RGWY wifi thermostat to an old hvac with no c wire? - Home Improvement Stack Exchange
![What to do about this RH to RC wire? I didn't see anything in the manual for this situation. Ecobee 3 lite : r/ecobee What to do about this RH to RC wire? I didn't see anything in the manual for this situation. Ecobee 3 lite : r/ecobee](https://i.redd.it/3958484nkne51.jpg)
What to do about this RH to RC wire? I didn't see anything in the manual for this situation. Ecobee 3 lite : r/ecobee
![hvac - How to move from RH/RC thermostat to C thermostat in AC only system? - Home Improvement Stack Exchange hvac - How to move from RH/RC thermostat to C thermostat in AC only system? - Home Improvement Stack Exchange](https://i.stack.imgur.com/8zdy2.jpg)
hvac - How to move from RH/RC thermostat to C thermostat in AC only system? - Home Improvement Stack Exchange
![hvac - On a thermostat, are "R" and "Rh" terminals the same thing? - Home Improvement Stack Exchange hvac - On a thermostat, are "R" and "Rh" terminals the same thing? - Home Improvement Stack Exchange](https://i.stack.imgur.com/TMTXJ.png)
hvac - On a thermostat, are "R" and "Rh" terminals the same thing? - Home Improvement Stack Exchange
![Replacing my Honeywell thermostat for Amazon thermostat. R and RC jumper. I'm clear about W,Y,G and C.. but Im not sure about R and RC.. Do I have to shoose both?.. or Replacing my Honeywell thermostat for Amazon thermostat. R and RC jumper. I'm clear about W,Y,G and C.. but Im not sure about R and RC.. Do I have to shoose both?.. or](https://i.redd.it/0u7uznamj2f81.png)
Replacing my Honeywell thermostat for Amazon thermostat. R and RC jumper. I'm clear about W,Y,G and C.. but Im not sure about R and RC.. Do I have to shoose both?.. or
![I have two separate R wires on my thermostat. What do I need to know about my ecobee thermostat installation? I have two separate R wires on my thermostat. What do I need to know about my ecobee thermostat installation?](https://storage.googleapis.com/article_attachments/Dual%20transformer_Backplate_Standard%20thermostat%20wires.jpg)