I am trying to install a thermostat and something doesn't make sense,now are you really suppose to match color with letter,example G for green,W for white and R for red,because that's not what I have been hearing,but that's how my old thermostat is wired,its just three wires and everyone keeps talking about a black wire,I don't have a black wire,just green,white and red,I'm a rookie,so I just want to know if I really should wire the new one the same color to that letter.Its cold here in Ohio,please help asap.Thanx,Tod

Hi Tod

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but that's how my old thermostat is wired

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If your old thermostat was hooked up so G was green wire, R was red wire, and W was the white wire then that is exactly what you want to repeat using the new thermostat (in most cases).

Good luck!

Mark