> It makes no sense but my total costs went up It does make sense if you were scewing around with the temperature values in excess of 2°C, because the HVAC wou

> It makes no sense but my total costs went up It does make sense if you were scewing around with the temperature values in excess of 2°C, because the HVAC would work harder to reestablish a new steady state. Most houses have thermal mass and heat inertia and sometimes it takes hours to reach a new temperature set point, the HVAC working at full load to do so. It depends on many factors and it's not easy to optimize without logging the temperatures, the operating cycles of the HVAC and understanding the whole process.