naturist wrote:
I replaced mine with a generic brand home t-stat from Lowes' that required nothing but a couple AA batteries. Just get one that has it's own batteries. As I recall, it was about $20, and has built in switches to control both furnace and a/c. The trick will be figuring out which wires to connect where to get it to do what the switches say, since whatever you've got is obviously hooked up wrong.
The T-Stats you speak of don't have a switch for A/C fan SPEED. Unless one wants to have the speed stuck either high or low they will have to add a switch.