"Gary" wrote in message
om...

. . . what is a "setpoint"? Is it the temperature at which the A/C (or
heater) is to TURN ON or is it the temperature the A/C (or heater) is
to MAINTAIN?

In my thermostat, a set point is a temperature setting
the user loaded into the system (to turn on furnace when
temp. falls to say 66 deg., or to turn on AC when temp.
rises to say 75 deg.) as distinct from an actual
temperature, i.e. what the system says the ambient
temperature is right now. Mine makes no difference
between the TURN ON setpoint and the MAINTAIN
setpoint.

--
Don Phillipson
Carlsbad Springs (Ottawa, Canada)
dphillipson[at]trytel.com