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If you're adding a fancy new thermostat, you'll need to connect the C terminal. The thermostat will then be powered by the transformer, using the R and C terminals. … However, since in your situation, the R terminal from the transformer is actually going to the W terminal on the thermostat. …

Honeywell thermostats (also Nest, and probably others) require the C wire to come from the cooling system, in systems that have multiple transformers.

If there's not an extra wire in the cable that runs up to the thermostat. Then you'll have to pull a new wire/cable. …

You'll have to bring a wire from the transformer in the heater, up to the thermostat location. This may require pulling a whole new 3 wire cable. … This image shows how the new thermostat should be connected to the system. …

Simply run a (new or additional) thermostat cable from the furnace up to the thermostat. Then wire it as follows: Remove any jumpers between R and Rc on the Ecobee. …

If you connect the C terminal on the thermostat, to that C terminal on the furnace control board. That should power your new thermostat. …

You have to have a thermostat that has an "Auto" mode (not the same as a fan auto mode), and you'll have to set the heat/cool temperatures 3-4 degrees apart. …

Yes, the terminal labeled C on the transformer is where you want to connect the C wire to the thermostat. … However, you'll want to make sure that the transformer is large enough to also supply power to the thermostat. If the thermostat draws too much power, you could end up burning out your transformer. …

So you'll have to use a thermostat that can work with separate transformers. If the thermostat you choose requires a C wire, you'll likely want to supply the C from the A/C transformer. … If you have two R wires at the thermostat. The best bet is to remove the jumper between Rh and Rc, and connect the separate wires to separate R terminals. …

However, since the jumper is currently in place, you'll almost certainly want to leave have it on the new thermostat. … If your system only has a single control transformer (typical in forced air systems), you'll only have one R wire coming to the thermostat. …

If you want the blower to come on, you'd have to connect an additional wire between the W terminal on the thermostat, and the W terminal in the air handler. Aside from that, the wiring looks fine. …

That would mean that you need to: Remove the jumper between R and Rc Connect Rh from boiler to R on the thermostat W from boiler to W on thermostat R from A/C to Rc on thermostat Y from A/C to Y on thermostat … G from A/C to G on thermostat …

It's a little unclear exactly what you're asking, but it sounds like you're on the right track. If the orange wire is unused (unconnected at both ends), you can use it as a C wire. Connect the one e …

To control the fan via the G wire from the thermostat, you're going to have to use a relay to turn on the blower. … You'll energize the coil of the relay using the G wire from the thermostat, and the 24V common terminal from the transformer. …

Connect the blue wire from the thermostat cable, to the C terminal in the furnace. Then connect the blue with at the thermostat, to the C terminal of the new thermostat. …