Ok, thanks all for your quick responses. Wa8yxm thanks for your inputs, I went and checked the wires going to the furnace, there are actually 5 wires in there. A 12 volt, two white and two grey. I disconnected a white wire that controls the furnace, if this one is disconnected, the heat and eventually the fan will stop after all the heat is dissipated. There is another white wire that controls the heat only, if I disconnect the second one, the fan only runs but not the heat.
So, I installed a bi-metal T=stat in series with the white wire that controls the furnace On/Off. Actually cut the white wire and connect it to the new T stat, one end to one screw of the T stat, the other to the other screw.
Now, for Room heat, I put the living room furnace switch on and at full heat. I then put the switch ON on the room T Stat witch will make the continuity but only if the temperature lever on this new T stat calls for heat. When the room temp reach the room T stat preset, it cuts the power to the furnace. The furnace finishes it's cycle and shuts off.
For living room heat, I keep the room T stat ON and at full heat, and the living room T stat ON, but this time, the living room T stat has the controls, it will shutt off the furnace once the living room is at temp.
Looks like it will work? The grey wires, I do not know what they are used for but If I disconnect them, the furnace completely stops, fan and heat, so I do not touch these ones.
Any advices?
