A:AnswerA C wire delivers constant 24 volt power to run a smart thermostat. For a typical furnace plus AC system there will be 4 wires and the C wire will be a 5th wire. If you don't already have a C wire, it will likely require making a connection at the furnace. You may have an unconnected 5th wire tucked in the wall. If you feel like you can manage connecting or adding a C wire, there are lots of sites on the internet that have information on doing it. But if you don't feel comfortable messing around inside your furnace, call a technician. It is less expensive to call them before you mess up your furnace.
A:AnswerI am pretty sure you can use the thermostat without WiFi but it really is designed for use with WiFi. Without WiFi this thermostat will be no better than a standard programmable thermostat. With WiFi, access from a smart phone and an outdoor temperature reading are the only additional features.
A:AnswerThe WiFi Smart Color Thermostat has support for a forced air system with 2 heating stages using W and W2 wires. It does not have anything more than a single G wire for the fan. I don't know if that is enough for your Goodman furnace.
A:AnswerYes. You should be able to unclip the faceplate and use the existing holes to install the new thermostat. The important issue is getting the wires in the right spots. This thermostat is very bright compared to the old one, forcing me to close the bedroom door.
