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I’m trying to change my thermostat to Ecobee 3. The old one had 4 wires in the wall but only 2 are used. See photos. 1 to w and 1 to r. From what I understand I need a c wire from a 24v transformer. One option I saw is to buy a plugin 24v transformer and use that to connect 2 wires 2 c and rc. Will that work? I can’t run the new wires so there is an outlet next to the thermostat which I guess I could use to plugin the transformer into and then have the new wire go up the wall into the thermostat. Not pretty. I’m wondering about the 2 extra wires in the wall that weren’t used. Are those the same 2 wires connected to the 24v box in my other picture? Are they being used? Is that what my old thermostat wire is connected to? Can I use those wires as is? Or can I disconnect them from the 24v transformer and connect them to a plugin transformer in the boiler room? Thanks for the help