Thanks to everyone for your help.
Is a thermostat, TSTAT and RM TH all the same thing?
If a properly running systems run for long periods of time, doesn't that translate to high energy bills? What would be a reasonable ratio of on to off time?
I didn't want to take much of anyone's time, but I guess I should disclose that my system is not running right. It was installed in a new house four years ago. I've had to have the system recharged 3 times, the last time a few weeks ago. The previous two times fixed the short cycling, but not this time.
The AC company found a leak in my evaporator coil. I guess it needs to be fixed, but it's going to be expensive. I was hoping that the recharging would buy me some time, but i guess the leak has gotten too big.
Lastly, when they found the problem, the guy did not reseal the evaporator coil housing access panel. I just went up in the attic and noticed there is some cold air coming out. I guess i will get up there with duct tape, but I can't imagine it having that big an effect. There is also air coming out of my drain pipe (because there is no cap on it). I guess I will put some tape on that too.
Thanks everyone.