Does a thermostat's span setting have any affect on the amount of energy used? My digital thermostat has a span setting of 1,2, or 3 degrees. With the 1 degree setting, it doesn't run very long when it is on, but it turns on and off more often. With the 3 degree span, it doesn't kick on as often, but it runs longer. For whatever reason, I just dislike to hear a unit cycling on and off all the time; it just gives me the impression it's using more energy, but it may have nothing to do with anything. My house is older, and I'm sure the insulation is not up to par with a modern home, but again, that may not make a difference with the span setting.