The current thermostat (Honeywell digital) has 4 wires w,y,g,and r. But the y is also actually green. I wish to put in a programmable. Does it need to be 4 wire? The system is a/c and gas forced air. Thx Lance

What type of thermostat will replace a 8 wire Trane -model#BAYSTAT239A thermostat. I have aux. heat and emerg. Heat. Which of the below are heat/cool signals, heat/cool supply, aux heat/ emerg. Heat; fan signal? g - o - x2 - y - t - r - w - b -

I bought a honeywell ct8775c1005 thermostat model to replace an old 1970's thermostat. HOwever, there are three wires that connected the old one that controlled heating and air conditioning and the fan. I tried connected the new one and it worked for heating, but NOT AC. I connected the red...

Hi there, I'm switching my thermostat for a newer digital one, though when I took out the old thermostat, there were only 2 black wires with white stripes on them. The new thermostat calls for an RH wire and a W wire, but I have no way of distinguishing the two apart. How can I tell which wire...

Our new puppy pulled the thermostat wires loose from the outside air conditioning unit. No damage to any wires, but I need to know which wire goes to which. From the inside, the wires are blue and yellow. The outside unit has brown and blue. Which to which?