1. The thermostat measures the temperature wherever the thermostat is located. Ours is in the hallway. The room on the other side of that wall is always colder than the rest of the house. The living room seems to always be the warmest, except if I've been doing a lot of work in the kitchen. The difference can be up to 5 degrees. So if we set it to 76, it -could- get as cool as 71 in my office. I hate that, but there's really no way to balance the air flow in this house any better without ripping the roof off and building an entire new duct system. We don't have an attic, so the ducts are directly between the roof and the ceiling of the house.
2. We try to keep it at 78-80 in the summer during the day, and 76 at night. In the winter, it's usually set to 68 at night and 70-72 during the day.
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