We got dual-zone heating/cooling in the new house, just like the old house... two heat pumps, each with it's own thermostat servicing a different section of the house. Over here, by my bedroom the display says 79/80, meaning it's 79 degrees but the A/C is set to cool to 80. On the other side of the house, the thermostat says 76/76. A/C is not running in either location. It is COLD AS FUCK over there on the other side of the house but it's supposed to be 76 degrees?. Over here, I am perfectly comfortable - but it's only 3 degrees warmer? I have nothing to compare them with, so I am going out tomorrow to get a few thermometers and see what kind of readings I get. I suspect these things are just junk. They are basic non-programmable units that were installed with the new heat pumps in 2007. It's a White-Rodgers 1F89-211, which is nothing special: http://www.emersonclimate.com/Documents/White-Rodgers/instruction_sheets/0037-6233.pdf If my suspicions are correct, and these things are hosed - I am going to replace them with WiFi-enabled units so I can keep an eye on them and override people fucking around with the temperatures.