I have decided that my thermostat is running on the high side.
I have a lab grade digital hygrometer/thermometer. I bought it used and the last time it was calibrated was about 5 years ago, but it seems to be pretty accurate. Outdoors, it matches the readings at the local airport within the specified tolerance - within one degree and one percent humidity. Most of my other temperature and humidity measuring devices match it fairly close.
The one that is the farthest off, is the Robert Shaw thermostat for the Trane. And it is not a consistent error either.
At 72.5 degrees actual, the thermostat says 75. At 68 degrees, the thermostat says 72. So it is running from 2 to 4 degrees on the high side.
The thermostat is on an empty interior wall near the center of the house. No heat producing devices of any kind anywhere near it.
I have no idea what kind of reputation that brand has, but it hasn't left me with any warm fuzzies.
If I have the contractor replace it with the same model, would I have any expectation that a replacement would be any better?
Is there a replacement brand I should ask for instead?