![thermostat - Honeywell Mercury Themostat 3 Wire, replace with Digital/ Programmable? - Home Improvement Stack Exchange thermostat - Honeywell Mercury Themostat 3 Wire, replace with Digital/ Programmable? - Home Improvement Stack Exchange](https://i.stack.imgur.com/oHdJu.jpg)
thermostat - Honeywell Mercury Themostat 3 Wire, replace with Digital/ Programmable? - Home Improvement Stack Exchange
![I have an old Honeywell (Mercury) heat-only thermostat. Any recommendations how to wire this? I was expecting to see a red and white wire. Thanks! : r/Nest I have an old Honeywell (Mercury) heat-only thermostat. Any recommendations how to wire this? I was expecting to see a red and white wire. Thanks! : r/Nest](https://i.redd.it/n13iod72wj841.jpg)
I have an old Honeywell (Mercury) heat-only thermostat. Any recommendations how to wire this? I was expecting to see a red and white wire. Thanks! : r/Nest
![Old Honeywell mercury thermostat Compatible with Nest learning thermostat or Nest 2020 thermostat? : r/Nest Old Honeywell mercury thermostat Compatible with Nest learning thermostat or Nest 2020 thermostat? : r/Nest](https://i.redd.it/es8cjuxuxbd61.jpg)