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perry1 07-17-2010 08:55 AM

I have a Lennox G61V furnace and currently using a Honeywell CT3451 stat. I would like to replace my stat with a honeywell rth6400 or a Honeywell rth7500 model. What do you guys or girls suggest?

I only have 5 wires running to my stat.

My wiring right now is follows: 1 wire on each
G- blue

Would I have to run new wires directly to the furnace to get the RTH7500 model to work?

Would the rth6400 work just as good?

Any advice is greatly appreciated.

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