Deejoe, I do not know the specific temps because I do not know the loads for the house. But, There is no more or less total BTU because he only changed the t-stat. And yes, it should run constantly at a serverly low temp for the area.
Really gets cold means really cold for that area, Think about design temp joe. It depends on the area.
The reason that it is cycling different is because the digital stat is more sensitive to temperature change. PERIOD! Nothing was changed on the unit, or at least he didnt say that there was.