One of the oddities I found when we moved in was that there were two thermostats in the house. One controlled the air conditioner (that was installed sometime in the early 2000s) and the other controlled the boiler for heat. I wanted to upgrade to a smart thermostat and the Ecobee 3 was on sale on Amazon at the time so I purchased it.
|A/C thermostat in the stairwell.|
|Heat thermostat in the living room near the dining area.|
|Label the wires before removal.|
|Cable in a fastened down.|
|Used the hole to pull wire down, then snaked it through the joists.|
|Ecobee 3 installed.|