We bought a new home last year. Before we moved in, I also bought and installed an electronic thermostat. The kind that you can set to change to a certain setting at a certain time of day.
The way I have it set now is that at 6:15AM I have it warm the house up to 20C.
7:30AM, shortly before the Mrs and I leave, it goes down to 16C(this is probably the one I’ll be questioning later on).
5:15PM, roughly when we get home, it goes up to 21C.
Lastly, 10PM, it sets to 18C for sleeping at night.
The question I have is this. When we are at work for the day, is 16C too “cold” to be economical? For the most part, the weather this winter hasn’t been too cold. So, during the daytime when we were at work the house wouldn’t even hit 16 (or at least, I don’t think it would). When I would get home it would usually show 17 as the current house temp. However, now that the days are cold again (-15 to -25) the house will indeed cool to that temperature after some hours. Then, when I get home the furnace is on for an hour straight (give or take) to get the temperature back up to 21.
Being a new house, the furnace is quite effiecient (a new Trane) and the windows and insulation are all very good. We also have thick, thermal lined curtains or roman blinds on all the windows.
Is there a way to figure out the most “economical” setting?