![Honeywell Home RTH9585WF1004 Wi-Fi Smart Color Thermostat, 7 Day Programmable, Touch Screen, Energy Star, Alexa Ready, C-Wire Required, Thermostats - Amazon Canada Honeywell Home RTH9585WF1004 Wi-Fi Smart Color Thermostat, 7 Day Programmable, Touch Screen, Energy Star, Alexa Ready, C-Wire Required, Thermostats - Amazon Canada](https://m.media-amazon.com/images/I/81iSTdLWl4L._AC_UF894,1000_QL80_.jpg)
Honeywell Home RTH9585WF1004 Wi-Fi Smart Color Thermostat, 7 Day Programmable, Touch Screen, Energy Star, Alexa Ready, C-Wire Required, Thermostats - Amazon Canada
![Customer (and friend of mine) wanted a smart thermostat to control a waste oil furnace with a gas furnace as a second stage/backup. It's ugly but effective....Also works to isolate line voltage Customer (and friend of mine) wanted a smart thermostat to control a waste oil furnace with a gas furnace as a second stage/backup. It's ugly but effective....Also works to isolate line voltage](https://i.redd.it/2iewmufird881.jpg)
Customer (and friend of mine) wanted a smart thermostat to control a waste oil furnace with a gas furnace as a second stage/backup. It's ugly but effective....Also works to isolate line voltage
![hvac - How do I connect a WiFi thermostat to my furnace's primary control? - Home Improvement Stack Exchange hvac - How do I connect a WiFi thermostat to my furnace's primary control? - Home Improvement Stack Exchange](https://i.stack.imgur.com/P8htrl.png)