I changed out the old mercury thermostat on Sunday, and it was reading
4 degrees low from what the new programable reads. The old read 76
while to new 80. I think it was like 84 outside and after a couple
hours the house was very cool at 75.

All that to say, is it's nice to have a handle on the "real" temp, but
will be interesting/depressing to see what the bill looks like due to
the extra on time of the condensing unit. Some of that might be offset
by the fact that I have programmed it.