What temperature should I set my thermostat to?Whatever you want!
What's the point of having an HVAC system if you aren't comfortable? However, if you are interested in energy efficiency, then follow these guidelines:
In the summer: set your air conditioner to 75 degrees.
In the winter: set your furnace to 68-70 degrees during the day, and drop it to 60-65 degrees at night.
For more on this topic, try this article: