I'd like to put in a WiFi thermostat for my weekend home so I can turn on the heat prior to my arrival. My schedule is erratic so a simple programmable one won't work.
The Filtrete (Home Depot brand, made by 3M) says it requires "HVAC power (C-Wire) or an external transformer). I pulled the cover off the thermostat and it only had two wires so I guess I need the external transformer.
So, my question to you pros, is, how big a job is this? Am I looking at a couple hundred or a grand? What does the external transformer look like? Will it be an eyesore on my wall?