Hello, I am a new home owner and been doing a little research on my own to resolve this problem but thought I should ask the pros first. I have a 10 year old furnace with only 2 wires(R,W) running to my thermostat. I would like to get the cool air from my basement to the upper floor. My basement is finished and I cannot fish a new G wire without tearing into walls. Is it possible or safe to disconnect either R or W and use that wire to connect G to G? If not is there another option that safe and affordable. Thank you.

You can switch wires back an forth on your Thermostat to make the blower work. But after a few years it may start to do some ware and tare on your thermostat. If your furnace is easley accessible, add a blower switch at the furnace.

There are thermostats available (like the Bryant T6) that can manage fully featured systems using only 2 wires between the display module and the equipment control module. These were designed specifically for situations like what you have (limited availability of control wires).

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Originally Posted by T-Top

You can switch wires back an forth on your Thermostat to make the blower work. But after a few years it may start to do some ware and tare on your thermostat. If your furnace is easley accessible, add a blower switch at the furnace.

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Thanks for the info, I have been looking around on how to safely run a switch. Would someone be able to explain it here? Please?

Posting the brand/model# of the furnace would be helpful. One way to accomplish this: At the furnace, move the "W" wire to the "G" terminal. Turning the thermostat up will cause the furnace blower to run.

Thanks for everything, I simply switched the W to the G at the furnace. I only run the fan for a few hours a day so I don't burn out the fan motor. Thanks again.