![My heat-only system only has two or three wires connected to the thermostat. Am I compatible with ecobee? My heat-only system only has two or three wires connected to the thermostat. Am I compatible with ecobee?](https://storage.googleapis.com/article_attachments/227874667/rwcdiagram.png)
My heat-only system only has two or three wires connected to the thermostat. Am I compatible with ecobee?
![Aprilaire 8022 Thermostat, 3-wire to 4-wire Adapter Thermostat Accessory - Programmable Household Thermostats - Amazon.com Aprilaire 8022 Thermostat, 3-wire to 4-wire Adapter Thermostat Accessory - Programmable Household Thermostats - Amazon.com](https://m.media-amazon.com/images/I/61ZxiA7pZnL.jpg)
Aprilaire 8022 Thermostat, 3-wire to 4-wire Adapter Thermostat Accessory - Programmable Household Thermostats - Amazon.com
I have 3 wires connected (Y,W,Rh (have jumper to RC) to my HoneyWell RTH221B thermostat at upstairs but replacing this
![Wiring a Honeywell Room Thermostat - Honeywell or Resideo Thermostat Wiring Connection Tables & Hook-up Procedures Wiring a Honeywell Room Thermostat - Honeywell or Resideo Thermostat Wiring Connection Tables & Hook-up Procedures](https://inspectapedia.com/heat/Honeywell-TH611-Wires.jpg)
Wiring a Honeywell Room Thermostat - Honeywell or Resideo Thermostat Wiring Connection Tables & Hook-up Procedures
![wiring - How to figure out how to wire a 2 wire furnace to 3 wire thermostat - Home Improvement Stack Exchange wiring - How to figure out how to wire a 2 wire furnace to 3 wire thermostat - Home Improvement Stack Exchange](https://i.stack.imgur.com/2GD2h.jpg)